G5 Turns off after 10 minutes

My iMAC G5 just turns off after about 10 minutes. I had trouble with the power supply a few years ago and I replaced it and everything was great. Now it just turns off after about 10 minutes and I am wondering if the power supply is acting up again. Do these things have a problem like this? It was easy to replace, so I can just do that again if that will fix the problem. But I don't want to just start changing out parts and still have the problem. Is the power supply a problem with this model?

More info on the iMAC. The processor is 1.8 GHz PowerPC G5 the memory is 1 GB DDR SDRAM running Mac OS X Version 10.5.3. Buss speed 600 MHz, Number of CPUs 1. I just took it apart and cleaned the dust out to see if that will help. We will see.

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