I believe I know exactly what your problem is. If you can take a screen shot of the problem using your Grab utility, move it around in the background to see if the lines exist on the shot. Or use an external monitor and see if the lines are gone. To be sure take a photo of the problem and post it. If it's what I think, you may be able to get Apple to replace the screen for free. They've done three for me this summer but we've also had reports of them not honoring this, so a silver tongue helps. After I see your screen, and it's what I believe it to be, I'll give you case numbers and "in house" article number.
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I believe I know exactly what your problem is. If you can take a screen shot of the problem using your Grab utility, move it around in the background to see if the lines exist on the shot. Or use an external monitor and see if the lines are gone. To be sure take a photo of the problem and post it. If it's what I think, you may be able to get Apple to replace the screen for free. They've done three for me this summer but we've also had reports of them not honoring this, so a silver tongue helps. After I see your screen, and it's what I believe it to be, I'll give you case numbers and "in house" article number. Does your machine have a 1.83 GHz processor?
I believe I know exactly what your problem is. If you can take a screen shot of the problem using your Grab utility, move it around in the background to see if the lines exist on the shot. Or use an external monitor and see if the lines are gone. To be sure take a photo of the problem and post it. If it's what I think, you may be able to get Apple to replace the screen for free. They've done three for me this summer but we've also had reports of them not honoring this, so a silver tongue helps. After I see your screen, and it's what I believe it to be, I'll give you case numbers and "in house" article number.