This could be a warning sign of impending hard drive failure. If you haven't backed up your data, or any other files that you can't lose, now would be a good time to do it.
Last night I was on my computer doing the ordinary, talking on msn. Suddenly my computer froze so obviously I restarted. Upon restarting I was givin a black screen offering my to:
Strike f1 to restart, or f2 to setup.
Hitting f1 just made my processor make a beep, and the question would be restated. Upon restarting again, I got a:
Disk Read Error
Hit alt+controll+delete to restart
After hitting the famous four I would get one of those two above options.
However, this morning, I turned it on and all went normal and I'm having no more problems restarting.
Could this be my CPU overheating or something? What could this be, cause I don't want it happening again..

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic