Understand that everything I suggest is at your own risk ...
Have you tried simply rebooting, using the power switch, or even the power plug if need be?
If that fails, you might try booting from a live CD (Knoppix, DSL, Slax, a live CD installer, etc). If even that fails, you might have a serious hardware problem. That does not necessarily mean anything is wrong with your hard drive. -- although it could be.
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