They are dotted lines across the screen horizontally.

When I upgrading to Lion Mountain, now I see somes "Drops" in the images. They are dotted lines across the screen horizontally. I reformatted and reinstalled OS 10.8.2, but the problem persists. I went to service, thought it was a video card problem, but it was not.

I have this too! I just bought this iMac a few months back. These screen are having a lot of troubles from what I am reading. My horizontal lines are not that bad, but you can notice them.
I might sell these computer off quick as apparently the quality of these screens is a nightmare.

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