Hi everyone, I have this strange problem since i assembled my new PC. It works perfect until i start a game (tried GTA IV and BF3), after a couple of minutes of playing the PC just completely locks up, mouse or keyboard does not react and de HDD led on the computer just burns constantly. the sound turns into a sort of soft distorting noise, and sometimes after a while the monitor says: no signal. the only way to get the PC working again is by holding the power button. I have tried the following: replaced power supply; (i had a 600w cheap PS and replaced it with the 700w huntkey) tried a fresh windows 7 install on a normal HDD tried a fresh install on the SSD tried a different graphics card (8800gts) Ran a CPU stress test with Prime95 for about an hour with temperatures stable at 60 degrees celcius. no freezes. Installed all new drivers for everything. Ran a GPU benchmark, PC freezes after a while with both graphic cards. tried using one stick of RAM at a time voltages and temperatures from the bios: voltages: CPU core: 1,208V CPU i/o: 1,040v System agent voltage: 0,920v DRAM voltage: 1,488v 3.3v: 3,360V 5V: 5,045V 12V: 12.144V temps: CPU temp: 51 celcius System temperature: 30 celcius I ran memtest for about 10 hours, no errors. Monitured the temperatures while benchmarking, at the moment of the freeze this was the reading: CPU 43 celcius MB 45 celcius GPU 60 celcius SSD 30 celcius I have no idea what to try next, so i'm desperatly seeking your help Thanx in advance! specs: Windows 7 Ultimate 64-bit SP1 (fully updated) MSI P67a-c43 B3 Intel i5 2500k MSI GTX 560 twin frozr II OC 1GB G.Skill ripjawz DDR3 1333mhz 2 x 4 GB Huntkey 700w OCZ agility 3 120GB Only programs installed: GTA IV, BF3, Microsoft security essentials and some benchmark apps.