2008 IMAC Have lines going up and down on my screen. How do I get rid of them?

I have a 2008 I Mac. I have several lines going up and down on the screen. How do I get rid of them?

I wish I had a solution (and yours is a fairly recent Mac) but that symptom is similar to those of a failed screen. The repair is often $500-$1000! If you run an external monitor from this iMac, I'd try that to see if the problem goes away. If it is gone, then the screen itself on the iMac has gone bad and you can use an external monitor, they cost about $100 or so. If the lines also show up on an external monitor, then it is likely that your graphics chip has gone bad.
Another thing to try -- boot into safe mode, as safe mode bypasses some of the more advanced graphics hardware. If the screen is ok, you might be able to use your computer in a lower graphics mode.
Another thing to do: run the Apple hardware Test DVD that came with your Mac. It may pinpoint the problem immediately.

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