Lenovo THINKCENTRE 6396 - Manual (Page 80)

Beep symptoms
Beep symptoms are tones or a series of tones separated by pauses (intervals
without sound) during POST.
The following tables describes beep symptoms.
Beep Symptom FRU/Action
1, 2, or 3 beeps Reseat the memory modules. If the error
persists, replace the memory modules one at
a time until the failing module is
determined.
4, 5, 6, or 7 beeps
9, 10, or 11 beeps
Before replacing the system board, remove
any optional adapters (Express card, Modem
card, Media reader) and retry. If the problem
persists, replace the system board.
Otherwise, reinstall the optional adapters
one at a time until the failing adapter is
determined.
8 beeps Replace the system board.
74 Hardware Maintenance Manual