Определение ошибки в настройках BIOS по звуковому сигналу (BIOS POST CODES)
Страница 3. IBM POST Tone Codes

none

System board, power supply

1 short

System passed all tests

2 short

Display error

continuous

System board, power supply

1 long, 1 short

System board

1 long, 2 short

Video adapter

1 long, 3 short

EGA

3 long

3270 keyboard card