erasing old computer
I have a new computer and want to erase my old computer.
i want to wipe my computer.
iMac 21.5″, macOS 10.13
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See instructions in What to do before you sell, give away, trade in, or recycle your Mac - Apple Support
Skip the "If your Mac has Erase All Content and Settings" section and use the other section instead unless the Mac you want to erase is a newer computer that meets the requirements described there.