IMac shuts down at random, any ideas on cause?

My iMac (G5, no iSight)has in the last 2 weeks started to shut down at random, for example last night it shut down twice in a two hour period. It makes one click noise when it does this and all power is immediately lost. So far it always starts up straight away when the power button is pushed. I did have the power board? replaced a few years ago under Apples extended warrenty scheme and it has been fine since then. I have noticed a few other similar posts and my questions are: does this sound serious and what is causing it, could it be linked to the same issue as the warrenty scheme replacement? is there anything I can do to put right without a big bill coming my way!?
Regards,
David.

Welcome to Discussions - it sounds as if your power supply unit is failing, and yes, it could be the same problem as before. Unfortunately, Apple's extended warranty expired last year, so you would have to bear the expense yourself. However, first try vacuuming all the air vents, and open the machine up and vacuum the fans. This could help, as well as resetting the SMU
1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
2. Unplug all cables from the computer, including the power cord.
3. Wait 10 seconds.
4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
5. Let go of the power button.
6. Press the power button once more to start up your iMac.
Let us know how you make out,

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IMac shuts down at random, any ideas on cause?

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