AMD GA-K8N51GMF - Manual (Page 39)

BIOS Setup - 39 -
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Power On By Keyboard
Password Enter from 1 to 5 characters to set the Keyboard Power On Password.
Any KEY Press any key to power on the system.
Disabled Disable this function. (Default value)
Keyboard 98 If your keyboard have "POWER Key" button, you can press the key to power
on the system.
KB Power ON Password
When "Power On by Keyboard" set at Password, you can set the password here.
Enter Input password (from 1 to 5 characters) and press Enter to set the Keyboard
Power On password.
Power On By Mouse
Disabled Disabled this function. (Default value)
Enabled Double click on PS/2 mouse left button to power on the system.
AC BACK Function
Soft-Off When AC-power back to the system, the system will be in "Off" state.
(Default value)
Full-On When AC-power back to the system, the system always in "On" state.