stronge beep

my freind has just got abit nf 7 rev 2
system worked fine one week but today when he play MotoGP2
there is a strange short frequent beep
the system is not overclocked the temp looks fine
cpu 35c
system 22c
i have checked voltage 12.1v, 5.03v stable
when he run prime there is no beep stable system
i just noticed that the southbridge go hot when playing this game
(the system is runnig at default setting 166*11 barton 2500+default vcore default chipset.....)
so we placed a fan abrove it but the probleme still the same
can any one explain what mean those beep?

edit: all other game (battlefiled vietnam,cs....)work fine without beep
thanks for any help

anyone???

Can you tell what the beep code is? If you can figure that out it will make solving the problem much easier.

i think this is the abit monitor ,it start beeping with no reason as i explain abrove(short continuous beep)

Alot of short beeps or is it a two tone siren?