thanks everyone, sorry i didnt get back to you all sooner, yeah its just like a single beep, does it mostly while playing dirt 2, my system is overclocked but the cooling is pretty good, my cpu as the corsair h50 watercooler and i gave got 3 220mm fans in the case and a spot cooler over the ram, the graphics card is a gigabyte gtx 470 soc, it only does this beep in windows 7 64 bit, il try what you all say and see what happens cheers