|Even if the power button is lit, it can still be the power supply. The 12 volt rail |
could be okay, but probably the 5 volt rail is gone. Find an old power supply
that has the same number of pins on the main connector, either a 20 or 24 pin,
and just plug them then in ( you don't have to pull the old one ).
You might want to pull the side of the computer off, and turn the pc on, and see
if any LED's light up on the mother board.