My Mac book pro shows this grey distorted screen during startup. Any ideas?

Looks like the above for a few minutes but then will go to the login screen like normal and work perfectly.

Reset PRAM.  http://support.apple.com/kb/PH4405
Best.

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    You are entitled to 90 day telephone support from Apple. Try contacting them.
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    http://www.myservice.com/macbookpro.html
    http://www.ifixit.com/Device/MacBook_Pro
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