Mike,
Getting back to your G5 problem: the logic board in my 2.7 G5 was recently replaced under warranty because one day the computer decided it wouldn’t start up anymore. This isn’t an isolated occurance from what I’ve been reading. I had similar type problems like you but since the board replacement things seem to be running more smoothly. Before, I had unexpected crashes, a lot of trouble starting up and shutting down, etc. for no reason and performance was less than what I thought it should be. If your machine is still under warranty and you don’t have the Applecare Exrtended I strongly suggest you get it.
You might consider getting more RAM, too. Makes a difference with big apps like FCP. 512 Megs of RAM is barely enough to run the OS and you’ve only got another 512 after that for FCP, which can make use of up to 2.5 Gig.
– Don
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