A new, and serious, problem has developed with my trusty 1.33GHz PowerBook. It won't stay awake. Given my recent troubles with all my other hardware, I'm hoping the powerbook survives. Anyways, I came home, took it out of my bag and opened it up, and it wouldn't wake up. No big deal. It's done that before. They all have. I held the power button down for a while so it would reboot. It did. 5 minutes after reboot, in the middle of me doing stuff, it went to sleep again, and wouldn't wake up. Rinse, repeat about 5 times. I put in the Tiger DVD and tried to boot from it by using System Preferences (took me 3 more times to keep the computer awake long enough to set that)(and i can never remember which keys to hold down during boot). Performed a Repair Permissions and a Verify Disk with no bad news to report. Well, it slept itself again, so I closed the lid and went to sleep, trying not to think about it. This morning, it ran for, perhaps, an hour, and then slept. Then, another 20 minutes. Then, when I rebooted, the screen was filled with lots of small blocks until I shut it off. Then I rebooted and came straight to this forum. Ideas?