HT201191: Install memory in an iMac
Learn about Install memory in an iMac
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Helpful answers
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Jan 4, 2014 9:30 AM in response to Sheenapintarby babowa,It's very important to know which Mac OS it came with as the procedure will vary.
In all cases, you will need to back up your files as you will need to wipe your disk in the process and will lose everything on it.
So, if it came with a disk originally, you will need a disk - call Apple, give them your serial number and they'll send you a replacement.
If it didn't come with a disk, you an use recovery or internet recovery (depends upon your exact model) to wipe and reinstall.
And, why do you need to 'restore'?