|Unfortunately, when a powersupply has a meltdown it often takes other components with it. Only by replacing and testing with known good spare parts can you determine the extent of the damage. Unless you have access to a full set of spare parts including powersupply, motherboard, CPU, ram & graphics you may not be able to determine which other components have failed.|
What you can do is to disconnect all power & data cables to optic & hard drives, remove any/all plug-in cards. Leave only the motherboard, CPU with it's fan, keyboard and monitor. Leave only 1 stick of ram. Now try to boot. Do you get any BIOS Beep? Any display onscreen?
In my experience it can be something as simple as a faulty drive that prevents bootup or even a failed PCI card or slot. I had one motherboard that would fire up perfectly well with PCI cards in any of 4 out of 5 slots. Any card inserted in the damaged slot and it would not boot.
There have been occasions where I have pulled the motherboard & CPU and taken them to a tech for testing. ( turned out both were faulty but I had no way to tell without buying replacements )
So you need to work out just how much you are willing to spend or simply get a new system and slave the hard drive from the failed unit to retrieve your files.
Goin' Fishin' (Some day)