How do I bring my 3 year old macbook pro back to "factory new" condition but install my Mt. Lion from a flashdrive?

I have a mid 2009 MacBook Pro with Mt. Lion installed, but I have accumulated so many files that I would like to start over with a fresh machine, but using Mt. Lion which I have on a flash drive.  I am not worried about backup because my important files are on dropbox.  I just can't seem to get to the point where the machine is like new.  Do I have to start with the old original OS X install disks?

Well Factory New would be with the original version of OS X.
What you want is a Clean install of ML.
Boot from the flash drive that has the ML install files on it. Open Disk Utility and Erase the Macintosh HD partition. Exit out of DU and select Rinstall Mac OS X. When it is done you wil have a clean fresh copy of ML installed.

Similar Messages

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    Buswab wrote:
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    How to revert your Mac to Snow Leopard
    Restoring firmware on Intel Mac's

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    Portables and Magic Trackpad: Jumpy or erratic trackpad operation

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