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I have vertical lines showing up on my 2.16 GHz 2 GB RAM Core 2 Duo iMac. Any idea what's going on and what I need to do to fix it? My computer is also freezing frequently.

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    Screenshot or picture? – segiddins Jun 18 '12 at 23:43
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It could be either a driver issue or a hardware problem. If you are still under AppleCare, I would just take it to a Genius Bar so they can do a diagnosis and see if it's a hardware problem (the easier fix). Otherwise, I'd recommend doing a full backup and installing a fresh copy of OSX.

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    A lot of times this is usually a hardware issue. Usually the screen or the logic board/graphics card. Make an appointment this a Genius, they do free diagnostic even if you aren't under warranty that way you can at least get help with what may be wrong. – de_an777 Jun 19 '12 at 15:59

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