Danny Holt
Registered
I am trying to troubleshoot an odd problem that I am pretty sure is at least largely a system problem, though it may well have a hardware component as well. I have been getting vertical stripes at certain locations on my PowerBook G4 (FW800) display. I have posted three pictures here to illustrate the problem. Briefly, they are vertical stripes of one pixel in width that affect brightness but not color. They occur only in certain locations that seem to be dictated by the OS: e.g., on the menu bar, on the title bar of inactive windows, on the Dock, etc. If I drag an inactive window, the stripes move with the window. The problem occurs in all user accounts, at all resolutions, with all possible numbers of colors. I attached an external LCD panel and the problem occurred there as well. I reinstalled 10.4.8 and it made no difference. I have done all the standard things like disk verification and repair, permissions verification and repair, fsck, etc. Apple Hardware Test gave me a VRAM error of 2ATI/1/4, but since the problem I am experiencing seems to have a definite software component, given the location and behavior of the stripes, the VRAM error may or may not be related. I have a thread going at MacFixIt (here) but no solutions have been recommended yet. I'd be grateful for any thoughts you may have. Let me know if I can provide more information.
