I've had to send my Ti500 to Apple three times for similar problems. It will develop a symptom where it won't shut down, only re-start. After pulling all power it's completely dead. Last time they were supposed to replace it but instead did a repair. Am beginning to think I should have just kept the Lombard Powerbook the Ti500 replaced. > Just two weeks ago, I went through what sounds like exactly the same > scenario and I finally couldn't do a thing with my Ti-500. > I finally had to send it back to AppleCare who replaced the > Motherboard, DVD drive, Keyboard, and face plate(?). It wasn't even a > problem with the hard drive, or RAM!! It was extremely frustrating to > say the least. I haven't had any recent freezes or any problems since, > however the DVD is a little squirrelly since.