Please chime in if you know anything about this--it's such a weird problem... Recently, I've been getting strange magenta lines that are randomly drawn across parts of my display. The strangest thing is, if they appear across part of an image that I'm editing, they can get saved in that image file. This would seem to mean that they're not just artifacts that get drawn to the display, but are more "real," being drawn at the OS's display level. I have a CRT iMac running OS X 10.2.6. I've been using an appearance theme called Rhapsodized for many months before this problem began appearing. Over the same general period of time, my computer's been getting a lot less stable; apps will "unexpectedly quit," sometimes repeatedly (particularly Apple-made ones, though IE is a big culprit here). And then, out of nowhere, the screen goes blue, all apps quit, and the Finder relaunches. I can't think of any single app that I installed that could be causing all this, but to be honest, I just moved and couldn't vouch for what I've installed over the past few months. Here are some screenshots I've taken, demonstrating the problem: Across 3 columns in the Finder Another one across 3 columns in the Finder Across the center of my desktop background Across the center of an installer's dialog box Across the title of a dialog box's title bar Across a menu bar and title bar Across my Safari bookmarks bar Across a submenu of my Apple menu Has anyone ever seen anything like this? Do you think it's a hardware or software problem? I'll be trying some tests, like booting OS 9, logging in as a guest, etc. to see if I can learn anything. But otherwise, I'm ready to take it in for service (one month of AppleCare left), or reformat the whole HD, or both!