Sudden total boot failure. Any idea what would cause this??

Today I was adding more apps to my clean install (on an external drive) and I had to go back to my original "update" installation to get a password off Keychain (I did not migrate). After I got the pw, I shutdown and my Powerbook would not reboot! I got the chime and then utter blackness. No disk access was attempted on my external, nothing from internal drive, and still nothing when I tried the Leopard installation DVD.
I kept trying and finally (after 10-15 minutes of getting nothing except the initial startup sound) the screen lit up and I got to the Startup Manager disk selection. I was still unable to boot from the DVD; the boot sequence had progressed only part way and then totally stalled (I gave it about 3 times as long as it would normally take to boot from a CD or DVD). I tried this twice more so I thought I had suffered catastrophic hardware failure.
But, then, after a pram reset, I was able to restart into single-user mode and did a couple of the fsck's (file-system check in Unix) and it said the internal disk was OK both times. Got through login and to the Finder Desktop after a regular boot, and after a safe boot, but found that the Finder was corrupted and repeatedly crashed with almost everything I tried to do.
Reluctantly then tried to boot from external drive and found that - it worked!
Tried to fix internal drive unsuccessfully. Eventually found that DVD drive was working again too, so I did a Time Machine restore of the internal drive after booting from the Leopard install disk.
After getting the internal drive to boot again (Time Machine worked!!), the Wacom tablet driver immediately crashed (even though I had supposedly loaded a Leopard-compatible version), so I then went to Terminal and got rid of all the StartupItems and PreferencePanes in the root Library and my user Library. I tried rebooting and since it did so without issue this time, I hooked up Time Machine and made a new backup.
How did the total boot failure get caused? I had never seen anything like this before where the screen stayed totally black and not even the DVD would boot.
I am now back to "normal" after 7 hours. Moral of the story is that even when your computer looks completely dead, keep trying. I just hope it doesn't happen again, since I'm not sure what the issue was.

Faulty battery. Make Genius reservation and take this iPhone back.

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8/20/10 12:43:06 AM loginwindow[86] in pamsmauthenticate(): Failed to determine Kerberos principal name.

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