Asus D900MC User manual

ASUS Desktop PC
User Guide
D900MC/M900MC/D900MCES

2
Copyright © 2021 ASUSTeK Computer Inc. All Rights Reserved.
No part of this manual, including the products and software described in it, may be reproduced, transmitted,
transcribed, stored in a retrieval system, or translated into any language in any form or by any means, except
documentation kept by the purchaser for backup purposes, without the express written permission of ASUSTeK
Computer Inc. (“ASUS”).
Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless such
repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of the product is
defaced or missing.
ASUS PROVIDES THIS MANUAL “AS IS”WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE
LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR
LOSS OF PROFITS, LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE), EVEN IF
ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY DEFECT OR ERROR IN THIS
MANUAL OR PRODUCT.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR INFORMATIONAL USE
ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED AS A
COMMITMENT BY ASUS. ASUS ASSUMES NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES
THAT MAY APPEAR IN THIS MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
Products and corporate names appearing in this manual may or may not be registered trademarks or copyrights
of their respective companies, and are used only for identication or explanation and to the owners’benet,
without intent to infringe.
E19431
Revised Edition V2
November 2021
SERVICE AND SUPPORT
Visit our multi-language website at https://www.asus.com/support/.

3
Contents
Notices ................................................................................................................................................ 5
Safety information .........................................................................................................................10
Conventions used in this guide.................................................................................................11
Where to nd more information...............................................................................................11
Package contents...........................................................................................................................12
Chapter 1 Getting started
Welcome!...........................................................................................................................................13
Getting to know your computer...............................................................................................13
Setting up your computer...........................................................................................................17
Turning your computer ON ........................................................................................................19
Chapter 2 Connecting devices to your computer
Connecting a USB storage device............................................................................................21
Connecting microphone and speakers..................................................................................22
Changing to the external audio output.................................................................................25
Connecting multiple external displays ..................................................................................26
Connecting an HDTV ....................................................................................................................27
Chapter 3 Using your computer
Proper posture when using your Desktop PC......................................................................29
Using the memory card reader (Optional)............................................................................30
Using the optical drive (on selected models only).............................................................31
Conguring the USB ports using the BIOS............................................................................32
Conguring the HDD security setting using the BIOS......................................................33
Chapter 4 Connecting to the Internet
Wired connection...........................................................................................................................35
Chapter 5 Using ASUS Business Manager
ASUS Business Manager ..............................................................................................................39
Chapter 6 Troubleshooting
Troubleshooting .............................................................................................................................49

4
Appendix Working with Windows®
Starting for the rst time .............................................................................................................57
Start menu ........................................................................................................................................57
Windows® apps...............................................................................................................................58
Connecting to wireless networks.............................................................................................58
Connecting to wired networks..................................................................................................59
Turning your computer o .........................................................................................................59
Putting your computer to sleep................................................................................................59

5
Notices
ASUS Recycling/Takeback Services
ASUS recycling and takeback programs come from our commitment to the highest standards for
protecting our environment. We believe in providing solutions for you to be able to responsibly
recycle our products, batteries, other components, as well as the packaging materials. Please go to
http://csr.asus.com/english/Takeback.htm for the detailed recycling information in dierent regions.
REACH
Complying with the REACH (Registration, Evaluation, Authorisation, and Restriction of Chemicals)
regulatory framework, we published the chemical substances in our products at ASUS REACH
website at http://csr.asus.com/english/REACH.htm
Federal Communications Commission Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
• This device may not cause harmful interference; and
• This device must accept any interference received including interference that may cause
undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with manufacturer’s
instructions, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by turning the
equipment o and on, the user is encouraged to try to correct the interference by one or more of
the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit dierent from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
The use of shielded cables for connection of the monitor to the graphics card is required to
assure compliance with FCC regulations. Changes or modications to this unit not expressly
approved by the party responsible for compliance could void the user’s authority to operate this
equipment.
Lithium Battery Warning
CAUTION: Danger of explosion if battery is incorrectly replaced. Replace only with the same
or equivalent type recommended by the manufacturer. Dispose of used batteries according
to the manufacturer’s instructions.

6
Compliance Statement of Innovation, Science and Economic Development
Canada (ISED)
This device complies with Innovation, Science, and Economic Development Canada licence exempt
RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause
interference, and (2) this device must accept any interference, including interference that may
cause undesired operation of the device:
Operation in the band 5150–5250 MHz is only for indoor use to reduce the potential for harmful
interference to co-channel mobile satellite systems.
CAN ICES-003(B)/NMB-003(B)
Déclaration de conformité de Innovation, Sciences et Développement
économique Canada (ISED)
Le présent appareil est conforme aux CNR d’Innovation, Sciences et Développement économique
Canadaapplicables aux appareils radio exempts de licence. L’exploitation est autorisée aux deux
conditions suivantes : (1) l’appareil ne doit pas produire de brouillage, et (2) l’utilisateur de l’appareil
doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en
compromettre le fonctionnement.
La bande 5150 – 5250 MHz est réservée uniquement pour une utilisation à l’intérieur an de réduire
les risques de brouillage préjudiciable aux systèmes de satellites mobiles utilisant les mêmes
canaux.
CAN ICES-003(B)/NMB-003(B)
IC: Canadian Compliance Statement
Complies with the Canadian ICES-003 Class B specications. This device complies with RSS 210
of Industry Canada. This Class B device meets all the requirements of the Canadian interference-
causing equipment regulations.
This device complies with Industry Canada license exempt RSS standard(s). Operation is subject
to the following two conditions: this device may not cause interference, and (2) this device must
accept any interference, including interference that may cause undesired operation of the device.
Déclaration de conformité d’Industrie Canada
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada. Cet appareil
numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du
Canada.
Le présent appareil est conforme aux normes CNR d’Industrie Canada applicables aux appareils
radio exempts de licence. Son utilisation est sujette aux deux conditions suivantes : (1) cet appareil
ne doit pas créer d’interférences et (2) cet appareil doit tolérer tout type d’interférences, y compris
celles susceptibles de provoquer un fonctionnement non souhaité de l’appareil.
Avertissement relatif aux batteries Lithium
ATTENTION ! Danger d’explosion si la batterie n’est pas correctement remplacée. Remplacer
uniquement avec une batterie de type semblable ou équivalent, recommandée par le
fabricant. Jeter les batteries usagées conformément aux instructions du fabricant.

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VCCI: Japan Compliance Statement
VCCI Class B Statement
This is a Class B product based on the standard of the VCCI Council. If this is used near a radio or
television receiver, it may cause radio interference. Install and use equipment according to the
instruction manual.
Equipment registered based on the conrmation measurement at the user
installation site.
This is a product for which interference was measured at the present installation site and conrmed
to comply with the standard of Voluntary Control Council for Interference by Information
Technology Equipment (VCCI). Before using the equipment at any location other than the present
installation site, the member shall measure interference for conrmation and register the result to
VCCI.
India E-Waste (Management) Rules 2016
This product complies with the “India E-Waste (Management) Rules, 2016” and prohibits use of lead,
mercury, hexavalent chromium, polybrominated biphenyls (PBBs) and polybrominated diphenyl
ethers (PBDEs) in concentrations exceeding 0.1% by weight in homogenous materials and 0.01 %
by weight in homogenous materials for cadmium, except for the exemptions listed in Schedule II of
the Rule.
Canadian Department of Communications Statement
This digital apparatus does not exceed the Class B limits for radio noise emissions from digital
apparatus set out in the Radio Interference Regulations of the Canadian Department of
Communications.
This class B digital apparatus complies with Canadian ICES-003.
Déclaration du Département Canadien des Communications
Cet appareil numérique ne dépasse pas les limites de classe B en terme d’émissions de
nuisances sonores, par radio, par des appareils numériques, et ce conformément aux régulations
d’interférence par radio établies par le département canadien des communications.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.

8
NCC: Taiwan Wireless Statement
低功率射頻器材技術規範
「取得審驗證明之低功率射頻器材，非經核准，公司、商號或使用者均不得擅自變更頻率、加大
功率或變更原設計之特性及功能。低功率射頻器材之使用不得影響飛航安全及干擾合法通信；經
發現有干擾現象時，應立即停用，並改善至無干擾時方得繼續使用。前述合法通信，指依電信管
理法規定作業之無線電通信。低功率射頻器材須忍受合法通信或工業、科學及醫療用電波輻射性
電機設備之干擾。」 應避免影響附近雷達系統之操作。
Japan RF Equipment Statement
KC (RF Equipment)
RF Equipment Notices
CE: European Community Compliance Statement
The equipment complies with the RF Exposure Requirement 1999/519/EC, Council
Recommendation of 12 July 1999 on the limitation of exposure of the general public to
electromagnetic elds (0–300 GHz).
Wireless Radio Use
This device is restricted to indoor use when operating in the 5.15 to 5.25 GHz frequency band.
Exposure to Radio Frequency Energy
The radiated output power of the Wi-Fi technology is below the FCC radio frequency exposure
limits. Nevertheless, it is advised to use the wireless equipment in such a manner that the potential
for human contact during normal operation is minimized.
FCC Bluetooth Wireless Compliance
The antenna used with this transmitter must not be colocated or operated in conjunction with any
other antenna or transmitter subject to the conditions of the FCC Grant.
Bluetooth Industry Canada Statement
This Class B device meets all requirements of the Canadian interference-causing equipment
regulations.
Cet appareil numérique de la Class B respecte toutes les exigences du Règlement sur le matériel
brouilleur du Canada.
Simplied EU Declaration of Conformity
ASUSTek Computer Inc. hereby declares that this device is in compliance with the essential
requirements and other relevant provisions of Directive 2014/53/EU. Full text of EU declaration of
conformity is available at https://www.asus.com/support/.
The Wi-Fi operating in the band 5150-5350MHz shall be restricted to indoor use for countries listed
in the table below:

9
CD-ROM Drive Safety Warning
CLASS 1 LASER PRODUCT
WARNING! To prevent exposure to the optical drive’s laser, do not attempt to disassemble
or repair the optical drive by yourself. For your safety, contact a professional technician for
assistance.
Service warning label
WARNING! INVISIBLE LASER RADIATION WHEN OPEN. DO NOT STARE INTO BEAM OR VIEW
DIRECTLY WITH OPTICAL INSTRUMENTS.
CDRH Regulations
The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Administration
implemented regulations for laser products on August 2, 1976. These regulations apply to laser
products manufactured from August 1, 1976. Compliance is mandatory for products marketed in
the United States.
WARNING! Use of controls or adjustments or performance of procedures other than those
specied herein or in the laser product installation guide may result in hazardous radiation
exposure.
Optical Drive Safety Information
Laser Safety Information
Simplied UKCA Declaration of Conformity
ASUSTek Computer Inc. hereby declares that this device is in compliance with the essential
requirements and other relevant provisions of The Radio Equipment Regulations 2017 (S.I.
2017/1206). Full text of UKCA declaration of conformity is available at
https://www.asus.com/support/.
The Wi-Fi operating in the band 5150-5350MHz shall be restricted to indoor use for the country
listed below:
UK
AT BE BG CZ DK EE FR
DE IS IE IT EL ES CY
LV LI LT LU HU MT NL
NO PL PT RO SI SK TR
FI SE CH HR UK(NI)

10
Safety information
Disconnect the AC power and peripherals before cleaning. Wipe the Desktop PC using a clean
cellulose sponge or chamois cloth dampened with solution of nonabrasive detergent and a few
drops of warm water then remove any extra moisture with a dry cloth.
• DO NOT place on uneven or unstable work surfaces. Seek servicing if the casing has been
damaged.
• DO NOT expose to dirty or dusty environments. DO NOT operate during a gas leak.
• DO NOT place or drop objects on top and do not shove any foreign objects into the Desktop
PC.
• DO NOT expose to strong magnetic or electrical elds.
• DO NOT expose to or use near liquids, rain, or moisture. DO NOT use the modem during
electrical storms.
• Battery safety warning: DO NOT throw the battery in re. DO NOT short circuit the contacts.
DO NOT disassemble the battery.
• Use this product in environments with ambient temperatures between 5˚C (41˚F) and 40˚C
(104˚F).
• DO NOT cover the vents on the Desktop PC to prevent the system from getting overheated.
• DO NOT use damaged power cords, accessories, or other peripherals.
• To prevent electrical shock hazard, disconnect the power cable from the electrical outlet
before relocating the system.
• Seek professional assistance before using an adapter or extension cord. These devices could
interrupt the grounding circuit.
• Ensure that your power supply is set to the correct voltage in your area. If you are not sure
about the voltage of the electrical outlet you are using, contact your local power company.
• If the power supply is broken, do not try to x it by yourself. Contact a qualied service
technician or your retailer.
ENERGY STAR is a joint program of the U.S. Environmental
Protection Agency and the U.S. Department of Energy helping
us all save money and protect the environment through energy
ecient products and practices.
All ASUS products with the ENERGY STAR logo comply with the
ENERGY STAR standard, and the power management feature is
enabled by default. The monitor and computer are automatically
set to sleep after 10 and 30 minutes of user inactivity. To wake
your computer, click the mouse or press any key on the keyboard.
Please visit http://www.energystar.gov/powermanagement for detail information on
power management and its benets to the environment. In addition, please visit http://
www.energystar.gov for detail information on the ENERGY STAR joint program.
*Note: Energy Star is NOT supported on Freedos and Linux-based products.

11
Conventions used in this guide
To ensure that you perform certain tasks properly, take note of the following symbols used
throughout this manual.
DANGER/WARNING:Information to prevent injury to yourself
when trying to complete a task.
CAUTION: Information to prevent damage to the components
when trying to complete a task.
NOTE: Tips and additional information to help you complete a
task.
IMPORTANT: Instructions that you MUST follow to complete a
task.
Where to nd more information
Refer to the following sources for additional information and for product and software updates.
ASUS website
The ASUS website provides updated information on ASUS hardware and software products.
Refer to the ASUS website www.asus.com.
ASUS Local Technical Support
Visit ASUS website at https://www.asus.com/support/contact for the contact information of
local Technical Support Engineer.
Tutorial
Tool-less: D900MC is tool-less design. You can disassemble the chassis by removing knurled
thumb screws by hand, and replace hard disc drive and optical disc drive easily.
After replacement, please assemble D900MC back to the original state. For more
replacement and assembly information, please refer link as below.
https://www.youtube.com/watch?v=uWjnhf26xEU
Hazardous moving parts. Desktop should be completely shutdown before servicing product.
Replacing fan components should only be attempted by qualied service personnel.
Hazardous Moving Parts Warning
WARNING: Keep ngers and other body parts away from any moving parts.
CAUTION: DO NOT loosen the thumb screws to access the internal area of your
device. If service or repair is required, return your device to an authorized service
center.

12
Package contents
• If any of the above items is damaged or missing, contact your retailer.
• The illustrated items above are for reference only. Actual product specications may vary with
dierent models.
ASUS Desktop PC Keyboard x1 (Optional) Mouse x1 (Optional)
Power cord x1 Support DVD x1 Recovery DVD x1 (Optional)
Installation Guide
ASUS mouse pad x 1
(Optional)
Installation Guide x1 Warranty card x1

Getting to know your computer
Illustrations are for reference only. The ports and their locations, and the chassis color vary with
dierent models.
Welcome!
Thank you for purchasing the ASUS Desktop PC!
The ASUS Desktop PC provides cutting-edge performance, uncompromised reliability, and user-
centric utilities. All these values are encapsulated in a stunningly futuristic and stylish system
casing.
Read the ASUS Warranty Card before setting up your ASUS Desktop PC.
• The Desktop PC does not support Windows®7 operating system. ASUS is not responsible
for any loss or damage incurred by installing Window®7.
• Be careful when handling the desktop PC to prevent the risk of injury.
IMPORTANT! Do not use this Desktop PC for cryptocurrency mining (consuming a vast amount
of electricity and time to gain convertible virtual currency) and/or related activities.
ASUS Desktop PC 13
Chapter 1
Getting started

D900MC/M900MC/D900MCES Front panel
1. Power button. Press this button to turn on your computer.
2. HDD indicator. The LED lights up or blinks to indicate the status of the HDD.
3. Headphone port. This port connects to a headphone or speaker.
4. Audio combo port. This port connects to a microphone or a headphone.
5. USB 3.2 Gen 1 ports. The Universal Serial Bus 3.2 Gen 1 (USB 3.2 Gen 1) ports connect to USB
3.2 Gen 1 devices such as a mouse, printer, scanner, camera, PDA, and others.
6. USB 3.2 Gen 2 ports. The Universal Serial Bus 3.2 Gen 2 (USB 3.2 Gen 2) ports connect to USB
3.2 Gen 2 devices such as a mouse, printer, scanner, camera, PDA, and others.
7. USB 3.2 Gen 2 Type-C® port. The Universal Serial Bus 3.2 Gen 2 (USB 3.2 Gen 2) Type-C® port
connects to USB 3.2 Gen 2 Type-C® devices.
The output voltage of the USB 3.2 Gen 2 Type-C® ports is 5V, 1.5A.
8. IC smart card & SD card reader (optional). Insert a smart card or SD card into the
appropriate slot.
9. Optical disk drive indicator. The LED lights up or blinks to indicate the status of the ODD.
10. 5.25 inch optical disk drive bay. There is an optical disk drive in this bay.
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D900MC/M900MC/D900MCES Rear panel
1. PS/2 mouse port (green). This port is for a PS/2 mouse.
2. PS/2 keyboard port (purple). This port is for a PS/2 keyboard.
3. DisplayPorts. These ports are for DisplayPort-compatible devices.
4. HDMI® port. This port is for a High-Denition Multimedia Interface (HDMI®) connector, and is
HDCP compliant allowing playback of HD DVD, Blu-ray, and other protected content.
5. USB 3.2 Gen1 ports. These 9-pin Universal Serial Bus (USB) ports connect to USB 3.2 Gen 1
devices.
6. USB 2.0 ports. These Universal Serial Bus 2.0 (USB 2.0) ports connect to USB 2.0 devices such
as a mouse, printer, scanner, camera, PDA, and others.
7. Microphone port (pink). This port connects to a microphone.
8. Line Out port (lime). This port connects to a headphone or speaker. In a 4, 5.1, or
7.1-channel conguration, the function of this port becomes Front Speaker Out.
9. Line In port (light blue). This port connects to a tape, CD, DVD player, or other audio
sources.
Refer to the audio conguration table below for the function of the audio ports in the 2, 4, 5.1, or
7.1-channel conguration.
ASUS Desktop PC 15
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Audio 2, 4, 5.1, or 7.1-channel conguration
Port Headset
2-channel 4-channel 5.1-channel 7.1-channel
Light Blue (Rear panel) Line In Rear Speaker Out Rear Speaker Out Rear Speaker Out
Lime (Rear panel) Line Out Front Speaker Out Front Speaker Out Front Speaker Out
Pink (Rear panel) Mic In Mic In Bass/Center Bass/Center
Lime (Front panel) - - - Side Speaker Out
10. Power connector. Plug the power cord to this connector.
RATING: 115/230Vac, 50/60Hz, 4A/2A (Global)
220Vac, 50Hz, 2A (China)
115Vac, 50/60Hz, 4A (Taiwan)
115/230Vac, 50/60Hz, 4A/2A (Japan; Korea)
11. Expansion slot brackets. Remove the expansion slot bracket when installing an expansion
card.
12. Serial ports (optional). These 9-pin COM ports are for pointing devices or other serial
devices.
13. LAN (RJ-45) port. This port allows Gigabit connection to a Local Area Network (LAN)
through a network hub.
LAN port LED indications
Activity/Link LED Speed LED
Status Description Status Description
OFF No link OFF 10Mbps connection
ORANGE Linked ORANGE 100Mbps connection
BLINKING Data activity GREEN 1Gbps connection LAN port
SPEED LED
ACT/LINK LED
14. Air vents. These vents allow air ventilation.
DO NOT block the air vents on the chassis. Always provide proper ventilation for your computer.
15. VGA port. This port is for VGA-compatible devices such as a VGA monitor.
16. Parallel port (optional). This 25-pin port connects a parallel printer, a scanner, or other
devices.
16 Chapter 1: Getting started
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Setting up your computer
This section guides you through connecting the main hardware devices, such as the external
monitor, keyboard, mouse, and power cord, to your computer.
Using the onboard display output ports
Connect your monitor to the onboard display output port.
To connect an external monitor using the onboard display output ports:
1. Connect a monitor to a display on the rear panel of your computer.
2. Plug the monitor to a power source.
• If your computer comes with an ASUS Graphics Card, the graphics card is set as the primary
display device in the BIOS. Hence, connect your monitor to a display output port on the
graphics card.
• To connect multiple external monitors to your computer, refer to Connecting multiple
external display in Chapter 2 of this guide for details.
ASUS Desktop PC 17
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Connecting a USB keyboard and a USB mouse
Connect a USB keyboard and a USB mouse to the USB ports on the rear panel of your computer.
Connecting the power cord
Connect one end of the power cord to the power connector on the rear panel of your computer
and the other end to a power source.
`
For safety purpose, ONLY connect the power cord to a grounded electrical outlet..
18 Chapter 1: Getting started
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Turning your computer ON
This section describes how to turn on your computer after setting up your computer.
Turning your computer ON
To turn your computer ON:
1. Turn your monitor ON.
2. Press the power button on your computer.
3. Wait until the operating system loads automatically.
Power button
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20 Chapter 1: Getting started
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