How to reboot an imac to new.

I am selling my imac to a friend and i want to reboot it so its like new but i dont have the disks to do it. does anyone know if you can do it another way or where i can get a disk from ?
Thanks
Dan

To do a "wipe" of the computer - it sounds like you're interested in doing an Erase and Install of the OS.
Just shut down the computer first, then immediately after pressing the power button to turn on the computer, hold down command + R on the keyboard.
This will launch into the Mountain Lion Recovery Partition, we will select our language, then click continue, and on the next screen, you will see 4 options (below) :
Restore from a TM Backup
Reinstall OS X
Get help online
and Disk Utility
first, click on disk utility, and at the top left where the drives/partitions are listed, click on the partition that you use. It's normally called "Macintosh HD" or "Mac HD", and is usually on the 2nd line from the top left, just below and indented underneath your primary internal drive
after selecting the partition with your OS/Data installed to, then click the [erase] tab at the top, make sure format is "Mac OS Extended (Journaled)," and the name can stay as Macintosh HD.
Click the [Erase...] button at the bottom right, and it will now delete all the files on that partition (please backup anything you need FIRST, because data is not expected to be recoverable after an erase)
once that is done (normally under 10-15 seconds for normal erase), we will then exit out of disk utility. That will bring us back to the main menu for Recovery HD.
** if you'd like to install the OS for your friend and be nice, you can then click the 2nd option / "Reinstall OS X."
The re-install will prompt you for your apple ID/password, and then it will begin downloading the system files from Apple servers. It will take anywhere from 1-4 hours depending on your internet connection stability and speed.

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