I have come across a weird problem that seems stump me, I have had the same setup in my sig for about 3 years now and had no issues until recently. It started while playing Fallout 3 and has continued to get worse...it now does it with any graphic related program. If i try to run auto tune for my ati card it will shut down, if i try to launch 3d mark it will shut down...
I have monitored all the temps and all are in normal ranges cpu stays around 50c under load...gpu doesnt go any higher than 60c under load...chipset is at 40c ect... i am leaning twards the psu but im not sure, does anyone have any ideas?
Athalon 64 X2 5600 AM2
4 gig Corsair DHX XMS2 DDR2 6400
500w antec smartpower PSU
If it was a faulty GPU, the system shouldn't shut down straight away. As ulysses35 says, its most probbally the PSU that is past its time and needs to be replaced, it seems when it needs to juice the GPU for anything, it will not power it correctly, or overpower it perhaps and overload which will result in a shutdown.