Vertical lines on screen, computer freezing?

My MBP is about two years old now, and a couple weeks ago a bunch of vertical lines appeared on the screen and the computer would freeze. I can't get a screen shot b/c the computer's always frozen when they come up.
I can't link it to a specific activity or anything like that, and sometimes it happens several times in a row (I have to reboot each time) but sometimes it won't happen for days. It just happened again twice. Does anyone know what's wrong/how to fix it? Thanks.

See if this applies:
http://support.apple.com/kb/TS2377

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Those are temporary fixes and will get you up and running. I think you should call Apple or bring it back to the Apple Store BEFORE you try and resolve the vertical lines problem.
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You are still under warranty. Call Apple Care. Make sure you get a case number as all repairs have an additional 90 days of warranty.
#1 - You have 14 days from the date of purchase to return your computer with no questions asked.
#2 - You have 90 days of FREE phone tech support.
#3 - You have the standard one year Apple warranty.
#4 - If you've purchased an AppleCare Protection Plan, your warranty last for 3 years. You can obtain AppleCare anytime up to the first year of the purchase of your computer.
Take FULL advantage of your warranty. Posting on a message board should be done as a last resort and if you are out of warranty or Apple Care has expired.

Vertical lines on screen, computer freezing?

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