Hmmm.... i wrote all zero's, still dont work so its defo not the harddrive. Ill try memtest.
Edit: Ive tried memtest as usual the fans kicked up and it didn't finish.ill take out the ram and try with one stick.
Edit 2: I'm running out of options, all sticks of ram work fine. but the computer still dies. It sounds like its overheating, but its not getting no where near hot enough.
Do dells have there own powersupplys, this motherboard takes 24 pin but im not sure wether it will fry with another psu.
Edit 3: The motherboards faulty, and the pc is 2 months out of warranty, So im guna chook it. Thanks for the help.