|Before you go off willy nilly and buy parts how about some history of the computer. |
Did this just happen all of a sudden or were there problems prior to this condition?
Was there any interruption in the power to the computer or any lightning storms recently?
What prompted you to replace the power supply? Post the model of the new power supply and the model of the computer or if custom built, the motherboard.
Was anyone inside the case mucking around prior to this problem?