G5 PowerMac posts, but doesn't get past splash screen, fans rev to high

After installing the recent quicktime and iTunes update my PowerMac hasn't wanted to boot.
It posts (chimes) and gets to the white screen with the apple and the rotating spike pinwheel. The pinwheel rotates. After about a minute on this page the fans start to rev until their maxed out.
Anything I should try before bringing it into the local Apple Store?

Nope it might be a sotware problem.
15days of nightmare, too long to describe all problems that cause me this boot problem, and business i lost cause unable to deliver work on time..Grr i was ...better not to say.
First remove every cards pci, video card and ram and replug them on their slot, this normally as i understood will reset the video and the ram and you will be able to have a fresh reboot, you will have maybe to reset the clock. It is what i did at last. Don't reboot yet.
Second things.
1. go on System Preferences
2 go on Accounts
3 tick on Login Items
4 Tick the Hide little square to not open the ItunesHelper Application.
Then you can reboot. It works right now for me, i reboot 8 times now. I didn't try to completly shutdown the G5, i have some works to do with it so i will let him run for few days, hoping no problem will come.
Good Luck.
Denis. (As i was certain that all my Harware pci video and ram (even i chane the battery) were good, i try to find out if it was not a software issue cause this happens to me twice,after upgrading 10.4.6 to 10.4.11 and of course updating itunes and quicktime).

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