I am selling my iMac but would like to restore it back to its factory settings! How do i do this?

I am selling my iMac but would like to restore it back to its factory settings! How do i do this?

If you use iTunes to buy music or Apps for an iOS device run iTunes and Deauthorize your computer. Do the same with the Mac App Store program.
If your computer shipped with Lion you'll first want to need to restart the computer with the Recovery Partition (hold command R while you restart the computer) Once you've booted select the option to format the hard drive and then select the option to install the OS.
If your computer shipped with an earlier version of the OS, restart your computer with the system disk. Select Disk Utilities from the menubar options and format the hard drive. Then select the OS install option and install the OS.

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