Hey, any help on this issue would be greatly appreciated. It's been happening for 3 days and several restarts have not fixed the problem. The grey/bluish lines in the Finder windows and iTunes windows seem to be, well, check the pic. It's like the white is blown out, the lines are barely visible. All the other colors on screen are fine. Check out the shadow areas from the finder window and the Quicktime movie window. The lines appear fine/normal only in those areas. And as you can see from the movie window, no other colors on screen are affected. Does anyone have any ideas what could be causing this? And how to fix it? I'm using a 24" Aluminum iMac from Sept. 2007 running 10.5.6.