I recently left for a week, and left the computer on, and when i got back, it had frozen, so I turned it off and came back later to try turning it on. All it has done since then, however, is switch on, power up the fans (and i believe spin up the hdd's) and sit there blinking the dvd drive's light on and off, with the two case lights solid on. Nothing comes up on the screen, and I'm pretty sure there are no beeps. I can double check that.
I can get more info on the components of the computer if you need; I'm not right near it right now.