I knwo this sounds QUITE crazy (not for the techies though). I had a Chieftec 450W PSU which died after I "transported it" to my friend so he can use it afterwards. (Bought a new PSU so I didn't need the old Chieftec.)
When I assembled his PC with the new PSU, only the CPU cooling and the VGA cooling started. No PC speaker noise, no screen, and the PSU fan was dead. When I checked the PSU fan (removing the bottom metal cover), it was dead. (Not moving, totally burnt.)
The PSU when I last used it, WORKED PERFECTLY.
I just turned my PC off (I used it just before I replaced it with my new one).
My friend is really poor. He wants to repair the PSU. How should I start?
If ONLY the fan would be dead, I think we'd have some VGA output too (until the PSU overheats.. but the PC was only running for a few seconds.)
Multimeter and check the voltage?
And one huge note: When I plugged the PSU in after the assembly, there was a noise at the cable's end.. you know that zzzz-zzzz (can't really explain it with words, but the usual electric buzz which tells you to get the .... out as fast as you can. :))
(Of course if I try to run the PSU , I'll use a fan to keep it cool!)