IBM-Post-Beep-Codes

1 short beep Normal POST - system is ok
2 short beeps POST Error - error code shown on screen
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  

No beep Power supply or system board problem