Standard Original IBM POST Error Codes

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 keboard 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