IMac shuts off during sleep

I have an iMac G5 running 10.3.9. When it goes into sleep mode, a short time later the system completely shuts off. I have been out of town for a while, so I don't know exactly when this started, but my brother says it started a couple weeks ago. I would be surprised if any system-level hacks had been installed, since the rest of my family would be scared to try anything like that. As far as I know, nothing significant has been installed lately.
A bit more info:
If the computer goes to sleep based on an inactivity timer, it will sleep for a while (flashing power light) and then turn off. If I select Apple > Sleep, it immediately shuts off. I've already reset the PRAM.
Any ideas?
iMac G5 Mac OS X (10.3.9)

Hi Homer,
Welcome to Apple Discussions.
It would help us to know which G5 iMac "model" you have, how much RAM, etc. You can have this info displayed on the bottom of every post by going to 'preferences' which is located in the column on the right under your name, click on "My Settings" and filling in the information asked for.
This will help in providing you with the proper and/or correct troubleshooting solutions.
Thank You.
PS: If you do not know the model of your Mac, see Knowledge Base Article http://docs.info.apple.com/article.html?artnum=301724#301724 How to identify your iMac

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