Open Question: Computer blue screen of death help?

Now heres my problem i turn my computer on and my screen doesnt turn on with it until after a few restarts after i get the screen running i try to run in safe mode and its gets to the end of the filea thing on the screen and auto restarts if i run in normal mode it either freezes at the windows loading bar thing or starts up to the vista logo then blue screen i have tried to switch hdd's with another that also has vista installed but again same problem so i no its not software removed graphics card and same problem ram still works doesnt do aanything when no hdd's are running cd drive not in they all result in bsod so have i missed anything or do i needa new mother board for it??