iMac 24" (early 2009) shuts down randomly

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hi! reading forum years , now... registered because problem (ouch!) ... wonder if can help.... :)

imac shuts down randomly since installed yosemite. happen when i'm doing something, opening safari, launching app... system doesn't shut down if don't touch it. made investigations....

- re-install mavericks , snow leopard , problem remains. not related yosemite @ all.
- apple hardware test (the long one) says there's no problem piece of hardware (the imac didn't shuts down while performing test).
- there's nothing plugged mac, problem not related peripherals.
- there's no pattern system log. last messages recorded before system shuts down different (no errors).
- temperature registered in sensors fine, fans working properly.
- have ups unit current should nice , protected.

so... can shuts down fault of power supply unit? can switch on mac after shut down without problem. there's way test psu before pay new 1 (expensive part!)? idea of different causing trouble?

thanks!! ;)
 

maybe silly suggestion, did check power cable set on imac (not on ups).
 


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