First thing - back up your valuable data.
What OS are you using?
Do you have a floppy disk or CD in the drive? Maybe your computer crashed and tried to reboot but found a disk with no OS on it.
Turn off the computer and open the case and make sure all cards/cords/cables are seated tight. Make sure to check out the RAM sticks too.
Do a RAM test.
This one is a good one.
Let us know how it goes. I doubt it's your HD, but it's always possible. How old is the HD? How much free space is on it?
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