Display get blank [Closed]

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Hi.
I have a problem of display which occurs blank or black.Nothing any functional keys f3,f4,...f8,f9, (except f1,f2,f10).Advanced Boot option also not seem,bios utility also don't show hard disk status.
I am feared about if my hard disk may be cruppted.
This problem starts when I choose repair your computer option Windows 7 installation. Any suggestions for help.
Thank you

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