IMac 600mhz will not sleep, nor allow dbl-click open

I've got a stubborn little slot-loading iMac 600mhz here, running OS 9.2.1. It arrived from my friend with what seemed to be a dead PRAM battery and these two issues:
1. it will not go to sleep automatically, no matter how the energy saver control panel is set. It WILL go to sleep when manually told to do so (thru menu or power button)
2. It often will not allow opening anything with a double-click. You can only open files, the HD, apps, etc by using the "open" command in the menus.
3. Oddly, it completely ignores a PRAM-reset keyboard startup command, just starts up normally.
These symptoms have survived all of the following:
1. replaced PRAM battery
2. ran Tech Tool Pro (nothing found wrong)
3. Tech Tool Pro's PRAM "zap" command.
4. rebuilt desktop
5. Installed clean copy of OS 9.2.1
6. Reset PMU (via logic board button)
7. optimized the HD and swapped RAM modules(these were being done anyway as part of upgrade)
I'm trying to get this iMac ready to update the firmware and install OS X, but these pesky little symptoms worry me. what could be causing them?
PowerBook G4    

Unplug, then replug the keyboard. Try the mouse in one of the machine's USB slots. Try a different keyboard, or buy a replacement. It never hurts to have a spare in case you get a coffee spill or the like.
'Kinda' sounds like a fritzed keyboard.
David ...

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