Power Mac G5 won't shut down

My G5 takes an age to start up, the fans are running fast most of the time, when it comes to 'shut down' it won't! Have to switch off at mains.
When it is running it is OK, just noisy with these fans running at 3000rpm.
Frank Hollis

Well, you do not want to use a Disk with problems for anyehing, have you tried...
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.
If Disk Utility or fsck should fail to repair it, your best bet is DiskWarrior from Alsoft, you'll need the CD to boot from if you don't have another boot drive...
http://www.alsoft.com/DiskWarrior/
Your best bet is DiskWarrior, you need the CD/DVD though.
http://www.alsoft.com/DiskWarrior/
But others that may work…
Drive Genius…
http://www.prosofteng.com/products/drive_genius.php
TechTool Pro…
http://www.micromat.com/index.php?option=com_content&task=view&id=31&Itemid=83

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ps: please excuse my bad english!

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