Unable to switch Macbook Pro off?

Hi guys,
I recently made the move from pc to mac, and while I have gotten used to mac now, I still have 1 or 2 problems with it....
I have a macbook pro 13, 2.66 ghz core 2 duo, which I got in january, and recently, it WON'T shut down! Its stuck at the blue screen with the loader icon on it..
From what I have found, if I only use the laptop for a small period of time, it will shut down fine, However, if I use it for a few hours, it log off, and do everything, and then it will go the blue screen, and then the blie loader icon will appear, and I have to hold down the power button to turn it off.
I'm on 10.6.7, and I tried resetting the PRAM, but that didn't help. Unfortunately, the nearest apple store is roughly a thousand kilometers away,
so any ideas that you guys have would be much appreciated..
Thanks in advance,
Matthew

Since you already tried resetting the PRAM, and no Apple Store is near, I'd say do a fresh install using the OS X disc. There's some type of driver or software clash that's probably causing this. A fresh install will almost definitely solve it. To prevent it from happening again, make sure your all your software is patched, up-to-date, and all Apple Updates are installed. Good luck!

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Message was edited by: Dave Sawyer

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The solution.
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