IMac G5 shuts down from Sleep mode

My iMac G5, PPC, 10.4.11 goes to sleep when told or scheduled. Clicking the mouse or a key to wake up the system causes it to power down. We have been running 10.4.11 for some time, no system upgrades.
Any thoughts?

I have an early iMac G5 as well. Resetting the SMU is worth trying, but I hope you don't have a hardware problem. Early iMac G5's are notorious for having power supply failures which can lead to SMU/sleep/shutdown issues. Apple provided a [recently-ended|http://www.apple.com/support/imac/repairextensionprogram> 3-year repair extension program for early iMac G5s with power-related problems, and I ended up needing two replacement power supplies and a replacement logic board for mine.
There have been a number of discussions about iMac G5 shutdown issues, including suggestions for replacement hardware components if needed, at the iMac G5 forum here:
http://discussions.apple.com/category.jspa?categoryID=134

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