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Screen shows gray lines

Hi, I've got two gray horizontal dot lines up screen (in the status bar area) and some weeks later a new one, this time vertical in the middle of the screen.

When connecting to a big screen, such as a LG LED TV on the thunderbolt port > HDMI, the lines doesn't appear.

Is this a LCD screen problem? Or could be on the graphics card?

Can someone give me some information about it?

Thanks.

Answer this question I have this problem too

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This is a LCD screen problem. It sounds like dead pixels. Look on Wikihow on how to fix dead pixels. Best of luck!

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If it was the graphics card that was the problem, then when you're mirroring to other displays it would show up there as well. However overall, the problem sounds suspiciously like the LCD is damaged. If you have Apple Care, Apple may cover it. Otherwise you're best bet, price wise (Apple 'aint cheap to fix stuff), is to go to a computer repair shop or consider a new computer. Because usually these problems get worse over time.

I had a similar problem with my Macbook Air (same model) but my case was far more pronounced and the screen changed colour severely with the computer needing a new screen. Again, Apple will charge a lot. But Apple Care will take care of the problem if you have it.

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