G5 shuts down fans race, won't stay on, won't boot up

I just acquired a Power Mac G5 that worked fine when I tested it from the previous owner. As soon as I got it home, it will not operate properly. When it boots up, it either freezes, or goes black screen or I get the "you must restart" message. Often, it refuses to boot up at all. The fans race shortly after boot up, even if it only goes to black screen.
I have reset the SMU several times, unplugged/replugged and tried to reset the PRAM multiple times. Do you have any advice?

Let it cool an hour or more & see if you can...
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
If you have any temps in the 70°C/160°F range, that's likely it.

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Hello,
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G5 shuts down fans race, won't stay on, won't boot up

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