Ok, so I had a problem with ibook freezing every 15 minutes and requiring a manual shutdown. My screen was also dimming on and off and there was a bright light at the bottom of the screen. Randomly when I rebooted, the screen would be all fuzzy. I figured it must the logic board so I sent it in for repairs. Well they replaced the lcd screen, and that was it. It still freezes on me constantly( mostly when I move the screen or apply any pressure on the bottom of the machine. I've tried removing the extra ram, but that does not help at all. I have been on the phone with them and they insist it is not the logic board. Oh yeah, I had 4 kernel panics last night. Any one have any ideas what the problem might be? Software related perhaps? I've already had 3 repairs in the past 13 months and I just want a computer that works. Argh.