Imac powering off by itself

Hello,
This week my G5 20" iMac began powering off by itself. The CPU temperature is steady at around 70˚. I removed the back panel and cleaned the dust from all vents and fan ducts and it still powers off unexpectedly.
Serial number: QP527011T9U
Will anyone make suggestions or recommendations of how to repair this issue?
Has anyone else had this problem? edit...looks like I am not the only one. I did not purchase apple care so I fear this may come out of my pocket. I hope not though. I just want it fixed!
Any help is much appreciated.
http://www.GlacierAmps.com

Get yourself a firewire external drive, at least as large as your internal drive, then download SuperDuper!, which will make an exact bootable clone of your system. You can schedule automatic back-ups, and then be secure in the knowledge that whatever happens to your drive, you can have the contents at your finger tips. SD! also makes incremental back ups, changing on the clone only the data that has changed on your computer. This makes the backups (after the first one) very fast.
Hope this helps,
Miriam

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