Standard boot POST errors

1 short beep – System is OK
2 short beeps – POST Error – code shown on screen
No beep – Power supply or board problem
Continous beep – Power, board or keyboard problem
Repeating short beeps – Power supply or board problem
1 long, 1 short beep – System board problem
1 long, 2 short beeps – Display problem. MGA/CGA
1 long, 3 short beeps – Display problem. EGA
3 long beeps – 3270 keyboard error
Continous beep – Shutdown the system and refix RAM chips.