A line that goes across the screen thats multi colored

as discribed but the line will disappear at times.i am new to macs and i bought it second hand so i dont know if i should try to return it or its a small problem.can someone help.thanks, mark

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"so i dont know if i should try to return it"
I would if Article: http://support.apple.com/kb/TS2377 *MacBook Pro: Distorted video or no video issues* does not pertain to your model MBP which you did not provide any info on.
!http://i50.tinypic.com/izvwo1.gif!

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