My son suffered a similar problem recently, while he was taking a shower the power went off briefly and when it came back on his PC refused to work. Out of his system I have managed to recover his HDDs, RAM and GFX card; the PSU, MB and CPU are all dead. I made the mistake of plugging his PSU into my Father's system to test it only too find it killed his CPU too although his MB was not affected. It was an expensive week for me!!
If you get the chance to test all of the components you may find yourself lucky but from my experience I do not recommend plugging your PSU into another system.
All the best.