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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
How do I reset an older iMac?
iMac, macOS 10.13
You can use the following instructions to completely reset a Mac to factory settings. Note that step only applies to newer Macs and that you will use the other steps instead. What to do before you sell, give away, or trade in your Mac - Apple Support
You can use the following instructions to completely reset a Mac to factory settings. Note that step only applies to newer Macs and that you will use the other steps instead. What to do before you sell, give away, or trade in your Mac - Apple Support
What year model is the iMac?
see > Identify your iMac model - Apple Support
If you want to reset it for resale, donating or recycing?
see > What to do before you sell, give away, or trade in your Mac - Apple Support
If you just want to erase and reinstall the macOS?
resetting an older iMac
