How can i format my macbookpro?

i have tried to install mac os mountain lion on my macbookpro and after that i shuted it down.But when i tried to reopen it, it didn't open How can i format my computer?? Please answer!!!

Do you have a backup?
If so, follow the instructions in this thread.
https://discussions.apple.com/message/18354553#18354553
It says Lion, but the procedures are still the same.
If you don't have a backup, skip the erase portion or you will lose all your files.

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How can i format my macbookpro?

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