Hello there. For a very long time now I have a problem with my PCs. I say PCs because i have changed almost everything and the problem persists. First PC: AMD Athlon 3200+ MSI k8n-neo platinum 2gb kingston ddr1 G-force 7600GS Maxtor sata 150GB The problem is that when I play 3d games such as WoW, Starcraft2 and League of Legents the PC freezes and reboots. It may happen anytime such as after 5 minutes of gaming or maybe never happen (a bit rare though). As this pc was a bit old I thought that this could be the problem. So I changed to this one: Second PC: AMD Phenom II X6 1055T Gigabyte 870A-UD3 4gb kingston ddr3 ATI Radeon HD 4800 WD sata 3 750 GB Powersupply Thermaltake 700W I have changed the monitor too but the case, keyboard, mouse and speakers are still the same. The problem is still there. I really dont know what else to do. If any of you has a suggestion would be very helpfull. P.S. I have tried windows xp, windows 7 32bit and 64 bit. P.S.2: I have unplugged the dvd rom and the floppy.