Restart the Mac in Recovery Mode

Restart the Mac in Recovery Mode

First of all make sure you are connected to the Internet (open Safari and browse around). You need an internet connection to install Mac OS X. Restart the Mac by clicking on Apple > Restart and hold down the Command and R keys until the Recovery Mode Utilities window appears.
See:

Step 6: Erase the drive

Erase Mac OS X drive

Select Disk Utility and click on Continue. Now choose your main Startup Volume (typically called Macintosh HD in the sidebar on the left, and click on Unmount. Now choose the Erase tab and click Erase to wipe your hard drive. Note that this permanently erases all data on the hard drive so don’t do this unless you’ve cloned the drive or are happy to never have to get something from that drive again. When it’s finished exit the program by choosing Disk Utility and Quit Disk Utility.

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