small thin line across screen

I turned my mac on the other day to see a thin line that runs across the screen at all times, its white when on black and black when on white. If you take a screen shot of the screen its not there.


Any ideas


Thanks


Mark

iMac, Mac OS X (10.7.5)

Posted on Nov 26, 2012 4:10 AM

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small thin line across screen

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