G5 1.8 dp shuts of by itself 10min after boot up

my pm g5 stated acting up. is shut off on it own. at first it was once in a wile now
it starts up and 5 to 10min later it shuts down. i replaced prom battery and blew the dust out
to see if that would help, made no difference
i'm thinking power supply.
is there a way to check the power with a volt meter?
what pins and what should i be getting?
am i on the wrong track?
thanks fred

Not sure a PS voltage check would be much help, as the PS does allow the computer to boot and run for a short while. It is likely that either the PSU or the PS itself are detecting an overload or overtemp situation and snapping the power off.
You might want to get hold of Temperature Monitor at http://www.bresink.com/osx/TemperatureMonitor.html and see if you have something getting particularly warm.
That may be kind of tough, but what you can do is, on boot, open the Temperature Monitor short-term history window and watch what the temps are doing. This may take a while, but if something is going haywire, it should be obvious. The ten-minute figure is suggestive of temperature as I note on my machine this morning, that was the time interval from wake to general equilibrium of temps. (Of course, your mileage may vary.)
If it is not an overtemp problem, then it is a current loading problem, which may not be a problem with the computer but rather with the power supply. I replaced a seven year old supply last year when it didn't have enough oomph to power my newly-acquired Geforce 6800 video card. It would power itself down when the guts of the card was enabled during boot.
You might want to pull the power supply so you can get a good blast of compressed air through it. That's a bit of work, but they can over time accumulate a lot of dust in there. *Do go outside* when you blow it out, to preserve something of cleanliness inside your work space, as the process can be pretty nasty. That might help things out.

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G5 1.8 dp shuts of by itself 10min after boot up

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