Code Description
1 short beep System is ok
2 short beeps POST error-error code shown on screen no beep Power supply or system board problem continous beep power supply,system board,or keyboard problem
Repeating short beebs power supply or power 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 Display adapter problem (EGA)
3 long beeps 3270 keyboard card
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