First Gen G5 iMac: Shuts Down In Just Seconds

My first generation G5 iMac shuts down within about 30 seconds to several minutes upon boot up. I had it off for about 3 or 4 days days while away, prior to this it worked fine. I purchased it in November of 2004.
OS 10.4.8
I have it connected to an APC UPS, there was a lengthy power failure while I was away, but the iMac was off; it is connected to the UPS via USB cable, i've disconnected all unnecessary connections, opened up the iMac and blew dust out of it, but it still shuts down shortly after boot up.
Any suggestions would be appreciated.
Thanks!
1.8 GHZ 20 G5 iMac (Rev A) 1GB RAM/250GB HD   Mac OS X (10.4.6)  

Thanks all, and to Barry & MGW:
It looks as if my iMac is within the serial no. range of a recall for power supplies. My wife is taking the iMac to an Apple store today, she called Apple earlier this morning and got an appointment, also we have the AppleCare plan and are still covered. I will post again after the Apple Store visit with an update.
I use SuperDuper! It's a great program, unfortunately my last back-up is several weeks old (shame on me) and now the iMac won't stay on long enough to make a fresh backup.
Hopefully, a new power supply will fix things up and the HD will be untouched.

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