Before okorder /... Replacing the Power supply is pretty straight forward.... just undo the screws at the back of the casing, and it slips out from inside. Put the new one where you took the old one out, and swap the leads over (matching like for like). One thing I have noticed both times I've fitted a Power Supply is that the screw holes in the back of the Power Supply never, ever line-up properly with the screw holes for it in the back of the PC Casing........ found the trick to doing it is to loose fit the screws first (might need to go in at an angle), then tighten them all up and it'll line up properly like it's supposed to.
Obviously it needs repair or bin it.
power supply might be bad.
buy a power supply tester there only $6 test the supply.
If you are not getting any power, then the power supply is shot. You need to replace the power supply unit. If there is power then check the video card and the monitor. If that is fine then your motherboard could be dead.
