G5 will not sleep (shuts down instead) !?

Appreciate any help here guys. Twin 2.5 G5 has started shutting itself down as opposed to sleeping. This occurs if I select sleep from the menu or the energy saver reaches the time set for it to sleep.
When this happens there are 4 to 5 clicks from the tower (same as the normal single click at power down) and then it shuts down.
Log states: Jul 2 15:20:04 localhost kernel[0]: ApplePMU::PMU forced shutdown, cause = -122
Appreciate any help....
Thanks
Power Mac G5 Mac OS X (10.4.10)

Hi, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!
There is some recent discussion of -122 here
http://discussions.apple.com/thread.jspa?threadID=984175&start=0&tstart=0
It seems that in this case the predictions of doom were somewhat pessimistic. Apparently.
If you have any questions please post again. Good Luck.

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