IMac Shuts Down after 5 Minutes, No Matter What

Hi Guys,
I have a serious problem. Last night, after about a week of not using my computer, I turned it on, jumped in the shower, came out, and it was off (not sleeping, just completely off). So turned it on again, it loaded up, I opened up Safari, then boom, it shuts off again. I thought it might have something to do with temperature, but I have had temperature issues and I got a new thermal sensor a few months ago (and plus, when it overheated, it went to sleep, not shut down). I tried 2 more times, same results, after about 5 minutes, it would just shut down. I haven't backed anything up on my computer, I was wondering if someone knew what my problem was or any solutions to at least save my data (I was planning on buying a Time Capsule, but now I might have to put that $ toward a new computer).
I have a Rev B iMac G5, purchased around May of 2005. I am on Tiger. Thank you in advance.

"Is there a reason that this happened? What could have been causing it?"
Well, now you know you have a USB/peripheral conflict. You can plug each one back in one at a time until the problem re-occurs. This way you will know which one of your devices is the culprit.
Make sure all your peripherals/devices are up to date in their versions, drivers, etc.
http://docs.info.apple.com/article.html?artnum=58033 USB DeviceTroubleshooting
http://docs.info.apple.com/article.html?artnum=25392 Isolating issues in Mac OS X

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    Size: 3.92 KB
    Last Modified: 19/01/2007 13:07
    Location: /Library/Logs/panic.log
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