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PC info

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Standard colors for power supply
Color Description
Black ground, GND, COM
Orange +3,3 V
Red +5 V
Yellow +12 V
Pink +5 V Stand-by
Blue -12 V
White -5 V
Green Switch on
Grey Power Good (PWR_OK, +51 V)

BIOS Sounds
Beeps Description
Standard Original IBM POST Error Codes
1 short beep Normal POST - system is ok
2 short beeps POST Error - error code shown on screen
No beep Power supply or system board problem
Continuous beep Power supply, system board, or keyboard problem
Repeating short beeps Power supply or system board problem
1 long, 1 short beep System board problem
1 long, 2 short beeps Display adapter problem (MDA, CGA)
1 long, 3 short beeps Enhanced Graphics Adapter (EGA)
3 long beeps 3270 keyboard card

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Page was modified 24.07.2006