Okay, my computer worked fine last night. And it woke itself up fine this morning, as it's supposed to. A bit later, I heard the speakable alarm voice -- I didn't actually listen to it, but I assumed it was the usual "Mail is too dumb to figure out that it's still dialing before giving up" message that I get every morning. But by the time I drug myself out of bed to look at it, the screen had been filled with a dark blue background and a large orange symbol. I think it's the Firewire symbol -- a circle with a solid bar and two dashed bars radiating from it? (It's too early in the morning to go find pics.) At any rate, it's one of the symbols for devices I don't use. The symbol was floating, so at first I assumed it was something from the .Mac screensavers -- a strange and alarming choice, but I don't make them. However, the screen wouldn't wake from it, and I hadn't been snoozing long enough to put the hard disk to sleep. I had to reboot, and when I did, I couldn't find that image in the .Mac slideshow. It's working fine now, but I don't like random weirdness, as it tends to mean problems later. Anyone have an idea what was going on here?