I don't know what's up with your computer, but that's not important.
The important thing is you get your paper in, right? My only suggestion is to take out your hard drive and put it in another computer, such as your friends:
1) Unplug your computer and open it up.
2) Disconnect all the wires from the hard drive and take it out.
3) Printed on the hard drive (or on a label) you should see something about slave, master, etc. Switch the jumper from Master to Slave.
4) Get to another computer and plug the drive in using the spare connector on the wire that leads to the existing hard drive. Fire up the computer and your disk (should) be recognised.
5) Get all of your files, then take the hard drive back out, switch the jumper to Master, and put it back in your old computer.
Now you'll have your files, but you'll still have a broken computer. It sounds to me like your CPU has overheated.
Hope that helps,
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since Oct 2005