|The powersupply has blown. There is no telling what if any other damage was done when the meltdown happened.|
I have had systems where the PSU was the only loss and others where the CPU, Motherboard, graphics card and PCI network cards were all write-offs when the powersupply gave out.
You need to decide what value it will be to invest in a new powersupply, knowing that the rest of the system may also be trashed. If you have access to a known good spare powersupply for testing purposes then begin there.
Goin' Fishin' (Some day)