I bought a refurbished first gen MBA about a year and a half ago. (It's under applecare for another 1.5 years). I have had terrible problems with video playback and trying to do the even most mild editing in Aperture and iMovie. Also, the screen is sometimes scrambled: Black chunks will appear like holes in the desktop image; The menubar will get scrambled; or safari will have weird misalignments around the toolbar/url. Apple replaced the logic board about 6 months ago. I've continued to have these problems. I took it to the genius bar again today and the rep told me it was a problem with the graphics card and that they would replace the card. Then he said the logic board would be replaced since the logic board is fused to the video card. That confused me. If the card is fused to the logic board, then it must have already been replaced the last time. He agreed, but at the same time assured me that this time it would somehow be different. I wasn't going to argue with him, but I have low expectations for any real results in improving performance. Can anyone clarify for me what he was talking about? Am I wrong to believe that a second logic board replacement (and thereby a second graphics card) will solve the issues I am having?