Funky lines on screen that don't appear with a screen grab

I have been getting a weird grid of vertical lines showing up, in the exact same place on my iMac 24". The lines go from the top, all the way to the bottom. I can move windows over the lines and the lines stay put, showing up over whatever is in that part of the screen. It really gets weird when I take a screen capture using the "Grab" app built into OSX and nothing shows up on the screen grab. It is perfect in the resulting file.
It's not a reflection. Anyone else face a similar problem? It is not there all the time but is about 90% of the time. Thank you in advance!

Screengrabs normally won't capture display anomalies. You need a camera. Contact AppleCare's Express Lane.

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