I got my mom's old MacBook Pro but it has all her old stuff on it. How do I reset it to factory settings?

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Just reinstall OS X. Boot up your Mac from the OS X installation disc and follow the instructions. Before you select the installion hard drive, choose Utilities > Disk Utility from the menu bar. In Disk Utility, select the hard drive and choose "Erase". Then close Disk Utility and install OS X.

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