IMac 27" i3 - problems with wake from sleep

Hi
My farthers iMac 27 i3, has got this anoying problem, that the machine sometimes won't wake from sleep - maybe 1 out of 10. The only solution is to pull the wall socket, witch is a very bad solution. Pushing or holding the power button won't make the machine wake.
I can't hear the harddisk spinning up, so I guess it's not a display problem.
Can it be the PSU, or maybe just a software problem?
How can get closer to this problem?
Thanks a lot in advance

Don't have any non-Apple USB devices connected.  They may not like low power mode for USB on Energy Saver.

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