bought a motherboard processor combo and they worked. the bios wasn't working with the second mobo, same model ,and the third was working until i opened thee cd tray to install vista, then it sputtered and died. i really think it is the mobo, and if anyone can point me somewhere that would sell me a preferably amd dual core processor/mobo combo, or separate places to get both, i would love to hear from you. lol i have trued 2 different psu's that work and didn't make a difference. ram worked, and it would bee a little too expensive to just try to see if that is the problem.