Well were to start. Started was back when the pc would freeze up and would not be able to do anything, all the fans lights and screen still worked. This would happen fair few times, crash every few minutes to few hours or even days. After it freezing the pc would not boot up, apart from all fans and lights starting, just no bleep sound on boot up and nothing on screen this would happen for from 10minutes to an hour with it not booting, then after that would boot up fine with not changing anything. So did the usual test as much as I could but still same problem. So sent off the mother board for an rma seeing as the temps for all parts cpu, graphic card etc was perfectly normal. Motherboard came back and was full tested and with no problems. Then after that sent the whole pc off to get tested. The place which tested came back with saying it was graphic card problem ( but they did have problems seeing as the pc would not crash for them until the last day they had it). So got an rma done on that with BFG, who sent back whole new card. Then after say 4 minutes after installing the card the pc goes again, then again after few boot ups and now same thing will not boot. Just really stuck now and not to sure were to go next So question be does anyone have an idea on what it could be my problem? Tested all parts apart from the cpu and power supply. List of parts are as follows AMD 64 3700 San diego Asus A8n-Sli Geil 2gb (2x1gb) BFG Geforce 7800GT OC Hiper 580w WD 350gb So if could leave some info would be grateful Thanks.