ASROCK J4105-ITX Manual

Asrock J4105-ITX HHP Setup
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Connect the 24-pin power, SATA cable, HDMI, P3-ROC USB, and analog audio as
shown. Install the memory DIMM in the slot shown above. (Slot 1)
Connect the other side of the SATA cable to the SSD, and plug power into the SSD.

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To power on the system for the first time, short these two pins with a screwdriver or
other metallic object, switch, etc:
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This will only be required the first time you boot the system
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Boot the system and enter the BIOS by pressing <DEL> on the keyboard
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On the Advanced tab, select CPU Configuration
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Set CPU C States Support to Disabled

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Back out using <ESC> and enter the Chipset Configuration menu
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Set Restore on AC Power Loss to Power On
(this is what will make the board power on automatically)
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Back out of this menu and select Storage Configuration
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Set Asmedia SATA3 Mode to Disabled
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Back out and select Super I/O Configuration
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Set Serial Port 1 to Disabled
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Back out and select ACPI Configuration
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Make sure Suspend to RAM is set to Disabled
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Optionally, you can enable USB Keyboard Power on and USB Mouse Power On. This
probably isn’t necessary. If you have issues with the board turning on automatically,
enable these.
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Next, go to the Security tab and disable both options
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On the Boot tab, set Full Screen Logo to Disabled.
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Finally, go to the last tab, save and exit. 
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On this board, you can select the boot device if needed by pressing F11 during startup.
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