After running games or stressing the GPU (with Kombustor) my computer restarts without any message or beeps. I have been monitoring the temperatures, CPU doesnt pass the 70 c, and GPU is at 45 while idle, 75-80 stressed.
My system is :
QuadCore Intel Core i5-2300
Intel Woodworth DH61WW
NVIDIA GeForce GTX 470 (1280 MB)
4074 MB RAM (DDR3-1333 DDR3 SDRAM)
EPILSON 80plus 500W
it could also be your mobo
it is very flimsy
i had similar problem where my pcie connector was being bent and eventually broke my gfx card so do watch out
also you should run windows memory diagnostics to check your memory
Thats wierd because im running this system for a year + and it didnt have a single problem like that before.furthermore i was playing alot of BF3 which was really stressing my computer to the max and it didnt even shutdown\overheat once..