Sleepy iMac

Preamble

I was provided with a second hand G5 iMac 1.8 GHz (A1058) PowerMac 8.2 (not A1144). Unfortunately, it overheats and then shuts down, or rather, goes to sleep, shortly after being powered on.   This self imposed sleep happens quickly, especially if the processor is being pushed, such as by running a full screen video in VLC.

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