Hello. I have an iBook 600. OS 10.2.8 Up until now it has been a dream, but just this morning I opened it and when it woke up the screen looked very strange, lots of horizontal black lines of various lengths that jittered and flashed. Also the tool bar became blurred and unreadable, off and on, and icons etc. The cursor moved normally, and I was able to click on things and for example close a page and close an app. I turned off the iBook and turned it back on. It looked and acted OK. I ran 'repair permissions', turned off and turned on the machine again. Looked OK. I did about 30 minutes of word processing and the black lines suddenly returned. I closed the iBook and put it away. Later when I opened it to show someone, it looked OK again. It looks OK now too. I am wondering if this is the beginning of the famous screen troubles ice books are noted for. I have not done anything new to cause troubles, like install new software or memory. I mainly use the machine for light word processing. Any hints or suggestions? Fortunately my store warranty is still good for another year, so if I have to take it in I should be OK. Thanks, Tom