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Q: How do I reset my iMac to factory for resale?
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Jan 12, 2016 10:33 AMby Niel,Click here and follow the instructions. If the computer originally shipped with Mac OS X 10.6.8 or earlier, when you reach step 5, insert its original disk, restart with the C or Option key held down, use the Disk Utility to erase the internal drive, and install a fresh OS.
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Jan 12, 2016 10:34 AMby Phil0124,Read here first:
What to do before selling or giving away your Mac - Apple Support
Then you'll need to re-install the OS that originally came on the iMac.
How to reinstall OS X on your Mac - Apple Support
If your iMac came with OS installation discs you will need to use those to install the original OS, and include them with the Mac when you sell it.
