TB 27" Display - Black Horizonal Lines and Low Brightness (MBAir & MPro)

Example image shows TB display problem with MB Air (Mid-2013, 10.9.2). Same problem can be seen with Mac Pro (New, 10.9.2).
Before I box this thing up and send it back anyone have any tips?

Same problem here with my TB 27" (march 2014), only the horizontal lines on my screen are gray instead of black.
Cross-checked it with 2nd MacBook & 2nd 27" TB.
Thankfully my dealer is willing to swap it for a new one.

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Message was edited by: tomlindsay101

Welcome to Apple Discussions!
It sounds like there is a hardware problem of some sort with the graphics chips, and the only real fix is going to be to replace the logic board. So at some point, you will have to send your Mac off for repair.
In the US, you can sometimes arrange to get a loaner. You might ask if this would be possible where you are, since the repair is going to take so long.
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TB 27" Display - Black Horizonal Lines and Low Brightness (MBAir & MPro)

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