IMac G5 Sleep/Restart/Shut Down Not Responding - 10.4.11

I have a 20" G5 PPC iMac running 10.4.11 with 2.5 GB RAM.
I recently restarted the machine after it had been shut down over a long weekend.
Everything booted up and worked as usual until I tried to load iPhoto, which froze with the spinning wheel. I wasn't able to force it to quit, so shut down the machine. Restarted, iPhoto loaded, everything seemed as normal.
However, by habit I usually select Sleep from the Apple menu when I'm leaving the machine for a while - now Sleep does not work via the Apple menu (it works as normal when left as per the time set in the Energy Saver settings). I noticed that after I tried to make the machine sleep I was also unable to use the scroll functions in Firefox - unsure if this is connected.
The Restart and Shut Down and other commands from the Apple menu also do not work, if they are selected after Sleep has been selected from the Apple menu and the machine has not consequently been manually shut down (i.e. via the button on the back).
I've shut down and restarted several times to no effect and and have run Disk Utility, which found nothing to be repaired.
Now If I start up and then select Sleep from the Apple menu without first launching any other programs, the spinning wheel appears and I'm unable to click on or select anything on the desktop or from the Apple or Finder menus. The only way out is to manually switch off.
Can anyone suggest what may be wrong and how to go about fixing it?
Thanks in advance.

I've tried playing around with the Energy Saver settings in System Preferences - any attempt at changes or restoring defaults gives the spinning wheel and an application not responding message.
Shut Down and Restart now appear to work from the Apple menu, but the machine will now not sleep at all (even if left until it should do so according to the Energy Saver settings).
Any ideas?

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IMac G5 Sleep/Restart/Shut Down Not Responding - 10.4.11

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