HP dx2355 - Microtower PC Operating and maintenance manual

Hardware Reference Guide
HP Compaq Business Desktops
dx2355 Microtower Models
Document Part Number: 481137-001
February 2008
This guide provides basic information for upgrading this computer
model.

© Copyright 2008 Hewlett-Packard Development Company, L.P.
The information contained herein is subject to change without notice.
Microsoft, MS-DOS, Windows are trademarks of Microsoft Corporation in the
U.S. and other countries.
The only warranties for HP products and services are set forth in the express
warranty statements accompanying such products and services. Nothing herein
should be construed as constituting an additional warranty. HP shall not be
liable for technical or editorial errors or omissions contained herein.
This document contains proprietary information that is protected by copyright.
No part of this document may be photocopied, reproduced, or translated to
another language without the prior written consent of Hewlett-Packard
Company.
ÅWARNING: Text set off in this manner indicates that failure to follow
directions could result in bodily harm or loss of life.
ÄCAUTION: Text set off in this manner indicates that failure to follow
directions could result in damage to equipment or loss of information.
Hardware Reference Guide
HP Compaq Business Desktops
dx2355 Microtower Models
First Edition (February 2008)
Document Part Number: 481137-001

Hardware Reference Guide www.hp.com iii
Contents
1 Product Features
Standard Configuration Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
Front Panel Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
Rear Panel Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4
Windows Logo Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5
Special Mouse Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5
Serial Number Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
2 Hardware Upgrades
Serviceability Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
Warnings and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
Removing the Computer Access Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
Removing the Front Bezel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3
Installing Additional Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
DIMMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
DDR2-SDRAM DIMMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
Populating DIMM Sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
Installing DIMMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
Removing a 5.25" Drive Bezel Blank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10
Replacing or Upgrading a Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
Locating Drive Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12
Removing a Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13
Replacing a Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–19
Removing or Installing an Expansion Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–23
Reassembling the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–29

Hardware Reference Guide www.hp.com iv
Contents
A Specifications
B Battery Replacement
C Security Lock Provisions
Installing a Security Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–1
Cable Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–1
Padlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–2
D Electrostatic Discharge
Preventing Electrostatic Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D–1
Grounding Methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D–1
E Computer Operating Guidelines, Routine Care and Shipping
Preparation
Computer Operating Guidelines and Routine Care. . . . . . . . . . . . . . . . . . . . . . . . . . . . E–1
Optical Drive Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E–2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E–2
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E–2
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E–2
Shipping Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E–3

Hardware Reference Guide www.hp.com 1–1
1
Product Features
Standard Configuration Features
The HP Compaq Microtower features may vary depending on the
model. For a complete listing of the hardware and software installed
in the computer, run the Diagnostics for Windows utility. Instructions
for using this utility are provided in the Troubleshooting Guide on the
Documentation and Diagnostics CD.
Microtower Configuration

Hardware Reference Guide www.hp.com 1–2
Product Features
Front Panel Components
Drive configuration may vary by model.
Front Panel Components
1Optical Drives 6Power Button
2Optical Drive Activity Lights 7Optical Drive Eject Buttons
3Diskette Drive (optional) 8USB (Universal Serial Bus) Ports
4Diskette Drive Activity Light (optional) 9Headphone Jack
5Diskette Drive Eject Button (optional) -Microphone Connector

Hardware Reference Guide www.hp.com 1–3
Product Features
Rear Panel Components
Rear Panel Components
1Power Cord Connector 7nRJ-45 Network Connector
2Voltage Select Switch* 8lParallel Port Connector
3bPS/2 Mouse Connector 9cMonitor Connector
4aPS/2 Keyboard Connector -hHeadphone/Line-Out Connector
5oUniversal Serial Bus (USB) qjAudio/Line-In Connector
6mSerial Port Connector wgMicrophone Connector
✎Arrangement and number of connectors may vary by model.
* This applies for selected models and countries only.

Hardware Reference Guide www.hp.com 1–4
Product Features
Keyboard
Keyboard Components
1Function Keys Perform special functions depending on the software application
being used.
2Editing Keys Includes the following: Insert, Home, Page Up, Delete, End, and
Page Down.
3Status Lights Indicate the status of the computer and keyboard settings
(Num Lock, Caps Lock, and Scroll Lock).
4Numeric Keys Work like a calculator keypad.
5Arrow Keys Used to navigate through a document or Web site. These keys
allow you to move left, right, up, and down, using the keyboard
instead of the mouse.
6Ctrl Keys Used in combination with another key; its effect depends on the
application software you are using.
7Application Key* Used (like the right mouse button) to open pop-up menus in a
Microsoft Office application. May perform other functions in other
software applications.
8Windows Logo
Keys*
Used to open the Start menu in Microsoft Windows. Used in
combination with other keys to perform other functions.
9Alt Keys Used in combination with another key; its effect depends on the
application software you are using.
*Keys available in select geographic regions.

Hardware Reference Guide www.hp.com 1–5
Product Features
Windows Logo Key
Use the Windows Logo key in combination with other keys to
perform certain functions available in the Windows operating system.
Refer to the “Keyboard” section to identify the Windows Logo key.
Special Mouse Functions
Most software applications support the use of a mouse. The functions
assigned to each mouse button depend on the software applications
you are using.
Windows Logo Key Functions
Windows Logo Key Displays or hides the Start menu.
Windows Logo Key + dDisplays the Desktop.
Windows Logo Key + mMinimizes all open applications.
Shift + Windows Logo Key + m Undoes Minimize All.
Windows Logo Key + eLaunches My Computer.
Windows Logo Key + fLaunches Find Document.
Windows Logo Key + Ctrl + f Launches Find Computer.
Windows Logo Key + F1 Launches Windows Help.
Windows Logo Key + lLocks the computer if you are connected to a
network domain, or allows you to switch users if you
are not connected to a network domain.
Windows Logo Key + rLaunches the Run dialog box.
Windows Logo Key + uLaunches the Utility Manager.
Windows Logo Key + Tab Activates the next Taskbar button.

Hardware Reference Guide www.hp.com 1–6
Product Features
Serial Number Location
Each computer has a unique serial number and a product ID number
that are located on the top cover of the computer. Keep these numbers
available for use when contacting customer service for assistance.
Serial Number and Product ID Location

Hardware Reference Guide www.hp.com 2–1
2
Hardware Upgrades
Serviceability Features
The Microtower computer includes features that make it easy to
upgrade and service. A Torx T-15 screwdriver is needed for many of
the installation procedures described in this chapter.
Warnings and Cautions
Before performing upgrades be sure to carefully read all of the
applicable instructions, cautions, and warnings in this guide.
ÅWARNING: To reduce the risk of personal injury from electrical shock
and/or hot surfaces, be sure to disconnect the power cord from the wall
outlet and allow the internal system components to cool before touching.
ÅWARNING: To reduce the risk of electrical shock, fire, or damage to the
equipment, do not plug telecommunications/telephone connectors into the
network interface controller (NIC) receptacles.
ÄCAUTION: Static electricity can damage the electrical components of the
computer or optional equipment. Before beginning these procedures,
ensure that you are discharged of static electricity by briefly touching a
grounded metal object. See Chapter D, “Electrostatic Discharge” for
more information.
ÄCAUTION: Before removing the computer cover, ensure that the
computer is turned off and that the power cord is disconnected from the
electrical outlet.
ÅWARNING: Hazardous Moving Parts
Keep Fingers and Other Body Parts Away

Hardware Reference Guide www.hp.com 2–2
Hardware Upgrades
Removing the Computer Access Panel
1. Remove/disengage any security devices that prohibit opening the
computer.
2. Remove all removable media, such as diskettes or compact discs,
from the computer.
3. Turn off the computer properly through the operating system,
then turn off any external devices.
4. Disconnect the power cord from the power outlet and disconnect
any external devices.
ÄCAUTION: Regardless of the power-on state, voltage is always present
on the system board as long as the system is plugged into an active AC
outlet. You must disconnect the power cord to avoid damage to the
internal components of the computer.
5. Loosen the screw 1that secures the access panel to the computer
chassis.
6. Slide the access panel back 2about 1.3 cm (1/2 inch), then lift it
off the unit.
✎You may want to lay the computer on its side to install internal parts.
Be sure the side with the access panel is facing up.

Hardware Reference Guide www.hp.com 2–3
Hardware Upgrades
Removing the Computer Access Panel
Removing the Front Bezel
1. Remove/disengage any security devices that prohibit opening the
computer.
2. Remove all removable media, such as diskettes or compact discs,
from the computer.
3. Turn off the computer properly through the operating system,
then turn off any external devices.
4. Disconnect the power cord from the power outlet and disconnect
any external devices.
ÄCAUTION: Regardless of the power-on state, voltage is always present
on the system board as long as the system is plugged into an active AC
outlet. You must disconnect the power cord to avoid damage to the
internal components of the computer.
5. Remove the computer access panel.

Hardware Reference Guide www.hp.com 2–4
Hardware Upgrades
6. Press outward on the three latches on the right side of the bezel
1, then rotate the right side of the bezel off the chassis 2
followed by the left side.
Removing the Front Bezel

Hardware Reference Guide www.hp.com 2–5
Hardware Upgrades
Installing Additional Memory
The computer comes with double data rate 2 synchronous dynamic
random access memory (DDR2-SDRAM) dual inline memory
modules (DIMMs).
DIMMs
The memory sockets on the system board can be populated with up to
four industry-standard DIMMs. These memory sockets are populated
with at least one preinstalled DIMM. To achieve the maximum
memory support, you can populate the system board with up to 4GB
of memory configured in a high-performing dual channel mode.
DDR2-SDRAM DIMMs
For proper system operation, if the computer supports
DDR2-SDRAM DIMMs, the DIMMs must be:
■industry-standard 240-pin
■unbuffered PC2 6400 800 Mhz-compliant*
■1.8 volt DDR2-SDRAM DIMMs
The DDR2-SDRAM DIMMs must also:
■support CAS latency 6 (CL=6) for DDR2 / 800 Mhz*
■contain the mandatory JEDEC SPD information
In addition, the computer supports:
■512Mbit, 1Gbit and 2Gbit non-ECC memory technologies
■single-sided and double-sided DIMMS
✎The system will not start if you install unsupported DIMMs.
*Can downgrade support to PC4200 533 Mhz and PC2 5300 667
Mhz.

Hardware Reference Guide www.hp.com 2–6
Hardware Upgrades
Populating DIMM Sockets
The system will automatically operate in single channel mode, dual
channel Asymmetric mode, or higher-performing dual cahnnel
Interleaved mode, depending on how the DIMMs are installed.
■The system will operate in single channel mode if the DIMM
sockets are populated in one channel only.
■The system will operate in dual channel Asymmetric mode if the
total memory capacity of the DIMMs in Channel A is not equal to
the total memory capacity of the DIMMs in Channel B.
■The system will operate in a higher-performing dual channel
Interleaved mode if the total memory capacity of the DIMMs in
Channel A is equal to the total memory capacity of the DIMMs in
Channel B. However, the technology and device width can vary
between the channels. For example, if Channel A is populated
with two 512MB DIMMS and Channel B is populated with one
1GB DIMM, the system will operate in Interleaved mode.
■In any mode, the maximm operational speed is determined by the
slowest DIMM in the system.

Hardware Reference Guide www.hp.com 2–7
Hardware Upgrades
There are four DIMM sockets on the system board, with two sockets
per channel. The sockets are labeled XMM1, XMM2, XMM3, and
XMM4. Sockets XMM1 and XMM2 operate in memory channel A.
Sockets XMM3 and XMM4 operate in memory channel B.
DIMM Socket Locations
Item Description Socket Color
1DIMM socket XMM1, Channel A White
2DIMM socket XMM2, Channel B White
3DIMM socket XMM3, Channel A Black
4DIMM socket XMM4, Channel B Black

Hardware Reference Guide www.hp.com 2–8
Hardware Upgrades
Installing DIMMs
ÄCAUTION: The memory module sockets have gold metal contacts. When
upgrading the memory, it is important to use memory modules with gold
metal contacts to prevent corrosion and/or oxidation resulting from having
incompatible metals in contact with each other.
ÄCAUTION: Static electricity can damage the electronic components of
the computer or optional cards. Before beginning these procedures,
ensure that you are discharged of static electricity by briefly touching a
grounded metal object. For more informations, refer to Electrostatic
Discharge
ÄCAUTION: When handling a memory module, be careful not to touch
any of the contacts. Doing so may damage the module.
1. Turn off the computer properly through the operating system and
turn off any external devices.
2. Disconnect the power cord from the power outlet and disconnect
any external devices.
3. Remove the computer access panel.
4. Locate the memory module sockets on the system board.
ÅWARNING: To reduce risk of personal injury from hot surfaces, allow
the internal system components to cool before touching.

Hardware Reference Guide www.hp.com 2–9
Hardware Upgrades
5. Open both latches of the memory module socket 1, and insert the
memory module into the socket 2.
Installing a DIMM
✎A memory module can be installed in only one way. For maximum
performance, populate the sockets so that the memory capacity of
Channel A is equal to the memory capacity of Channel B. For
example, if you have one preinstalled DIMM in socket XMM1 and
are adding a second DIMM, it is recommended that you will install a
DIMM of equal memory capacity into the XMM3 or XMM4 socket.
Match the notch on the module with the tab on the memory socket.
6. Push the module down into the socket, ensuring that the module
is fully inserted and properly seated. Make sure the latches are in
the closed position 3.
7. Repeat steps 5 and 6 to install any additional modules.
8. Replace the access panel.
The computer should automatically recognize the additional memory
the next time you turn on the computer.

Hardware Reference Guide www.hp.com 2–10
Hardware Upgrades
Removing a 5.25" Drive Bezel Blank
If the computer was not shipped with a drive in the 5.25" option bay,
the bay will be covered by a bezel blank. If you add a drive to the
option bay, you must first remove the bezel blank.
1. Turn off the computer properly through the operating system and
turn off any external devices.
2. Disconnect the power cord from the power outlet and the
computer, and disconnect any external devices.
3. Remove the access panel and front bezel. Refer to “Removing the
Computer Access Panel” and “Removing the Front Bezel”.
4. While facing the inside of the front bezel, press the two retaining
tabs on the right towards the outer edge of the bezel 1and pull
the bezel blank inwards to remove it 2.
Removing a Bezel Blank
✎To install a bezel blank, slide the left side of the blank into the two
retainer slots on the left side of the front bezel then snap the right side
of the blank into place.