HT1444 Screen is blank on startup but works fine when doing a safe boot. What could be wrong?

I have a Mac book pro 15 inch and the screen goes blank on startup. Screen comes up on safe boot. Also updated OS on line and do not have a backup disk to repair from. What should I do?

got system to boot up in safe mode and went into disk utility and did a repair on disk permissions and restarted, now everything seems to be working as it should. Now i don't have to go out and buy a new Mac but than again maybe I should.

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