I had something like this happen to my P200.
I installed the Tie-fighter CD version, and made a boot disc for it, but it didn't work, so in a fit of rage I destroyed the boot disc(stupid I know :doh: ), and I went to turn on the comp, I reset the comp, and...it started up...but...it didn't detect the hard drive.
But, aside thought, have u had any thunderstorms lately?
Maybe it's something to do with your modem getting hit and the strike went to the vid card or something...well, just to tell you, your HD is prolly not coming back. That happened to me, and the HD got fried

I had a whole bunch of stuff on it too, like the latest Half-life update patch!
Well, that's my rant/helpful thought for the day
Cor