I have a 17" PowerBook G4 I got about 8 months ago. It's been absolutely wonderful, until today. I was just doing normal things on it, and it suddenly went to sleep while I was working on it! So I pressed a key to wake it back up, and a few minues later it went back to sleep again. Now it's been doing this all night. I thought maybe it had overheated (even though it wasn't particularily hot) so I shut it down and let it cool completely, but when I turned it on, after about a half an hour it began going to sleep again. While I'm even doing things on it. I have it plugged in to AC as always, but my battery is fully-charged anyway. It's set to never go to sleep no matter how long the inactivity has been. I haven't installed new software in at least a week. I haven't done anything out of the ordinary in a long, long time. I always install Software Updates when they become available. I've created a new user account (I'm on it right now) and it hasn't gone to sleep yet, but it hasn't yet been like an half an hour, which it seems to take to start acting up. I'm HOPING it won't go to sleep on this account, so I can at least know it's a software problem and not a hardware problem. I NEED this computer over the next few weeks as I have some VERY IMPORTANT video production projects due. Googling found a few people with similar problems, but I haven't found any solutions yet. Please, somebody, help me!