Booting/Crashing Problems with Dual Core 2.3GHz PowerMac

I'm wondering if anybody else is having this problem. ...
I'm having problems booting my new Mac... for the first few weeks everything was fine ... but for the last few of days it often takes 2 or 3 tries to boot to the desktop (it hangs during the boot process) and sometimes when it get there it freezes when I try to launch an app. Rebooting yet again usually solves the problem...
Yesterday after i got it booted it sounded like my disk drive was working for a long time after it was booting the computer was very slow and when i checked CPU usage was very high bit i was not running anything to cause that!
This evening I had to reboot 5 times before I was able to do anything .. and one time the fans kicked into high gear and sounded like a vacuum cleaner!
Once I got it going I opened Mail and checked my new eMails, opened Safari then left the computer for about a half hour and when I got back I had message on my screen saying I had to reboot!
When I got my Mac I immediately ran the full hardware test and it passed... Then I immediately added 2 GB of Crucial RAM and ran the full hardware and memory test yet gain and everything passed...
So it should NOT be a RAM issue.
Has anybody else seen this type of thing and/or has any suggestions on how to fix it or isolate the problem?
Thanks
- karen

Feldspar-
As I'm waiting for for my replacement Dual Core 2.3 G5 to arrive back from Apple, I've been scanning this site to see if there has been any conclusive determination about the underlying problems with the new G5s. So far, I'm sorry to report, I don't see any.
My recomendation to you is to talk directly to apple tech support If you aren't already. Although they may not have a definate solution at this point, you may be able to get a new machine, with more assurrances of it being healthy, than getting your current machine repaired at a service center. You have only 30 days from your purchase date to determine this, and in my case it took a few days working with them to get to the point where all of their tests and trials were done and my machine was classified DOA.
We have paid too much money for a machine that is only as reliable as the amount of time we're willing to spend to get it running after a few (or more)boots. One of the main reasons I've chosen Apple for all these years is that I didn't want to have to learn all of the underlying engineering and programming that make it work. I have always been willing to pay more money for a system that works when you turn it on the first time. I am confident that Apple wants very much to maintain their image of reliablility since much of their competitive edge is the advantage of great looking Apple hardware running their feature packed native software.
I am hoping that we haven't entered a new era with Apple products where my new best friend is going to be the tech guy at the local apple repair center: (not to knock any of them..by the way.)
Although I don't make my living on my cumputer as you do, I depend on my computer throughout my day for information, important financial transactions and comunication. It goes beyond inconvenient to have to send my machine back, for whatever reason. I am writing this on a rock solid G4 933 that has never had a single problem. Have I just been lucky?

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