I don't know if this would have to anything to do with it, but I did use one of those dust remover cans to blow out the dust in my fan this morning after I shut the computer down because I noticed it was really dusty. However, it seemed to just blow a bunch of liquid into the fan. The bottle says it dries instantly though, so i'm not sure if this caused the problem. I noticed it wouldn't turn on after I did this.
I was also moving my computer to a different part of the room, so I had to take all the wires connected to the computer out and put them back in. When I was almost done, I accidentally powered the computer on while trying to put it back in the cabinet, so I pushed the power button to turn it off. Then I hit the button again accidentally, and turned it off again. I'm not sure if this could have caused the problem too because I did not properly shut down the computer both times. I just held the power button down on the tower.
Any help would be appreciated. I would install XP again, but i'm pretty sure COMPAQ never gave us an XP CD, it was just already loaded on the computer.