Diagonal lines appearing on MacBook Pro screen

I can't seem to find any pattern to this happening, but every so often one of the windows in the foreground after being moved or resized will appear with diagonal black and white stripes. The desktop remains fine, it is just the window in the forgeground. Usually moving the window again or resizing will temporarily fix the problem. But once it starts it usually affects multiple applications. Safari seems fine, but some other programs I can't even scroll without it happening. A reboot or even logging in/out seems to fix it.
Another thing I noticed is that when this is happening is that if I take a screenshot the image shows up as the entire screenshot. Until I reboot or log out/in, I can't take any screenshots of anything but this image. Here is the screenshot:
http://farm4.static.flickr.com/3152/3062918393_6dd4a6168c.jpg?v=0
I don't know if this happens on both video cards, since I usually only run the 9400 and the issue is not very frequent. I'm thinking this might be a hardware issue with the video card, but wanted to see if anyone else had seen this.

It's also possible that you have an intermittent problem with the display that may not be tested with the AHT. It's hard to tell when it's so intermittent, but if you have an external display, you might see if it ever occurs on that.
Are you under warranty? If so, at least report the problem to Apple and ask for a case number. That way you will be able to establish that the problem first occurred under warranty. If your warranty runs out, and the problem suddenly gets bad enough that you can show it to someone, you will have established that it started under warranty. Apple has the enlightened policy that if a problem first occurs under warranty, they will honor the warranty until the problem is fixed, even if the warranty has run out.
Doing the fresh install of Leopard is the right thing to do to rule out software as a possible cause.
If this is a hardware problem, it will likely get worse over time. In the meantime, you might take note of what you were doing when it occurs--like if the computer was hot or something like that. If you can determine what triggers the stripes, you will be able to show it to someone.
Good luck!

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Guess you're not alone Jen, I have the similar issue, just that I can see the circles with pretty much any color in the screen and not just white. Infact, they jump around like ripples on still water when the screen moves ever so gently. Its a real pain when im doing stuff with the laptop in my lap or when im typing. Have you seen a similar issue when you move the screen?
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Here's my sitch: my MacBook Pro has really been acting out in terms of freezing with fields of vertical lines. Sometimes the screen will revert back to be free of the lines but remains unresponsive OR it shuts itself down and beeps. Sometimes it fails to wake up after sleep and when I attempt to power it on, it beeps. I took my Mac to a service provider and thinking it was a RAM problem, we ordered and put in new RAM. The problem persisted and then the logic board got replaced. Everything was seemingly fine and in working order when one day a kernel panic occurred and everything was happening all over again. I just brought it back to the service provider and we re-installed my original RAM that came with the Mac. It worked fine at first, but then the RAM beeps occurred again as well as the field of vertical lines that halt the whole system. At this point I'm simply confused at what could be the problem, as the Apple Hardware Test detected "no problem found," the PRAM/SMC have been reset, it booted up completely fine in safe mode, and I've run Disk Utility on Command + Recovery. The Apple Diagnostics tag also says that everything seems to be OK, but what could be the root of this problem??
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Also, as I mentioned to mchanxo Apple does offer a flat fee of $280 to replace any hardware that is going bad including the logic board. That could be another option but my concern with that is if it only applies to hardware that does not pass the Apple Hardware Test.
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Shlomofromoh wrote:
How do I record through Line in on Macbook Pro 13"?
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Message was edited by: Dave Sawyer

Diagonal lines appearing on MacBook Pro screen

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