IMac turns off instead of sleeping

This only recently started occurring, and I cannot correlate it with anything that I might have done.
When I tell my iMac G5 to go to sleep - be it via shortcut, menu, power button, anything - it turns off instead of sleeping. It does not shut down properly, but simply turns off suddenly and completely. Upon rebooting, everything seems to be functioning well.
Did all the usual reboot, fix permissions, and so forth, to no avail. Apple hardware test reports no problems, although it took over an hour to run an extended test.
Any help would be appreciated.

You haven't done anything, it's a power supply problem or a capacitor problem and you should take it in and have it seen to before it gets any worse. Make sure you have a backup of all your data before you take it in. If it's not an iSight, you can open the back and check the caps to see if they are swollen or leaking. While you're about it, vacuum the fans and the vent slots to see if excessive dust buildup is the problem.

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