G5 Dual 1.8Ghz -randomly very NOISY & FAST fan!

Hi I couldn't find a post for this elsewhere!
1 or 2 times a week my G5 dual 1.8Ghz fan will begin to speed up and become incredibly fast and noisy, when this happens it doesn't slow back down, it keeps going!
Once this begins I am often unable to shutdown or restart the computer and I have to resort to pressing the power button.
On restarting the fan is normal again, but it always happens again at some point.
This happens while the computer is 'awake', but might have happened from sleep once or twice (I can't remember).
Many thanks for your help,
Colin
G5 dual 1.8Ghz   Mac OS X (10.3.9)   2gb RAM

Hello Colin and welcome to the Apple forums.
1 or 2 times a week my G5 dual 1.8Ghz fan will begin to speed up and become incredibly fast and noisy, when this happens it doesn't slow back down, it keeps going!
Once this begins I am often unable to shutdown or restart the computer and I have to resort to pressing the power button.
This is what we call a "Kernal Panic" and basically the OS stops responding, also to hardware which slows down the fans from the default "turbo" mode your experiencing.
What could be causing this requires a careful process of elimination.
Disconnecting all other external hardware except a wired mouse, keyboard and one monitor is the first step.
Next is to backup all data, c boot from the G5 Tiger (not upgrade over Panther disk!) and Disk Utility Erase w/Zero option your boot drive. Reinstall Tiger fresh and immediatly Software update until clear. Install only vital apps from original sources and cd's (avoid those that alter your sytem/ use a admin password to install), files and data from backup. Update your drives driver software from the makers sites for Tiger.
If these two methods don't resolve the problem, then you should try installing a new boot drive (Zero it first) and repeating the step above to eliminate a bad boot drive.
Once these three steps are done and you still have problems, it could be a RAM or defective video card or other major hardware problem.

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