Just to clarify a G5 is not a Pro or "desktop Pro" (Mac Pro is an Intel based machine). Yours is a "Power Mac". Install a temp monitoring app to see the temperature (mainly the CPU temps). Mine runs around 50 to 60 Celsius and never more than 72. If the temps run to high she will shut down. G5 are great machines but it's not rare for them to go bad. Power supply issues and liquid coolant leaks are well know. Fans controllers have stopped working (the fans them selves are usually OK).
Check manufacturer its rare that a mac goes bad
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Is it the liquid cooled version? Replace the Pram battery yet?
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