The problem I am having is that lines will appear on my screen at random times (vertical and horizontal), or when I tilt the screen. I had it replaced at the Ginza store after my screen died, then I had it replaced a few weeks ago at the 5th Ave store and it's doing it again, but this time more colors of lines show but vertically and horizontally. In the last replacement the gave me a new screen and a logic board. It was good for about 4 days. Am I doing something wrong? I have read on the forum about people having small lines show, but my whole screen changes. My computer sits on my desk in my room, it never leaves. It's also a last gen 17 inch PowerBook. Is it time for me to buy a new one?