My computer won't shut down, it just restarts

my computer won't shut down, if I try to shut it down it just restarts.
If I hold the power button down on the computer face for 10 seconds it shuts down but will not restart after (the button remains unilluminated) I have to unplug it them plug it back in affterwards to start it again.
I've tried disk utility, Nortons, even restarting with command+S then typeing fsck- fy (return) as I read on one of your previous forms. but nothing seems to work, any help would be appreciated!
thank peter

First welcome to the discussions.
The first thing I would do is Repair Permissions.
http://discussions.apple.com/thread.jspa?messageID=607640&#607640
After reading all the reports on Norton and disruptive behavior it causes in OSX I would recommend UnInstalling it.
You might have an issue with something else causing your problem but reading through the link above and UnInstalling Norton is a good start to isolate your issue.
Cheers Don

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I'm new to this forum but I'm desperate for your help with my Macbook 10.4.11.
Recently it doesn't shut down properly and each time I shut it down thru the green apple, it just doesn't shut down definitely but after some seconds, the screen turns to black but my mouse's light is still on. When I close the lid, the sleep light is on, too.
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http://www.versiontracker.com/dyn/moreinfo/macosx/19596
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