G5 either shuts down overnite or stays awake all night but loses cursor?

My G5 has started shutting itself down every night from sleep. Prior to this it was staying awake all night, but losing its cursor. Ran Disk warrior and TechTool Pro with no serious problems. It won't run Apple Hardware Test-holding C key won't load AHT. Can't figure out what the problem is. Have 139GB free on 152 GB machine. Any ideas?
G5 Mac OS X (10.3.9)

It's option key to boot AHT cd. You can run it, but firmware and OS updates makes the disk veriosn obsolete. So don't panick over a false positive.
I would backup files and c boot from the installer disk, select Disk Utility and Repair Disk/Permissions see if that works. Also disable hard drive sleep in System Preferences>Energy
If not repeat above and Erase w/Zero option and reinstall the OS. If your going to bother with all that, might as well make the jump to Tiger and iLife '06 (not included with Tiger)

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This feature sets the device to go off after a certain amount of time of inactivity. In your case, it is set to go off after it is not being used for 1 minute.
In order to determine if the problem is in your device or in the software that was installed, you will need to perform a hard reset. What you should do is sync your palm first so all your info is backed up on your computer and then perform a hard reset. Then, if you still have this problem after the hard reset is performed, the device itself is defective and needs to be replaced. If this problem doesn't come up anymore, you can reinstall the programs again (or sync your treo to the computer to get all the info back again) and then see if this problem comes up again. If it starts shutting down again in middle of the night, you will need to determine which program is causing this problem.
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G5 either shuts down overnite or stays awake all night but loses cursor?

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