If you keep the power supply plugged into the motherboard (it needs a load to function) you can use a multimeter to test the two voltages it produces:
Yellow/black wires will show roughly 12 volts DC
Red/Black wires will show roughly 5 volts DC
When I say "roughly" I mean +/- 10% for tolerances. It won't be "spot on" the two figures quoted but near enough is good enough.
If you have these then it is most likely the motherboard.
Bookmarks