My 2006 Macbook Pro Only Starts sometimes

My 2006 Macbook pro starts sometimes and loads normal but sometimes it just loads to the Apple and the spinning gear. This just started happening recently. Any ideas? I have reset the Pram, and even installed lion again on the computer and it is still doing it.

Jakebeal,
have you tried going into Disk Utility and running its Verify Disk option, to make sure that everything’s OK with the folder structure on your MacBook Pro’s internal hard disk?

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My 2006 Macbook Pro Only Starts sometimes

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