I have an old iMac OS X and I cannot log in because I forgot my password. Can you help me get into the computer?
How can I log into an old iMac if I forgot my password?
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"Old" is rather inexact but we will assume yours is not running one of the latest macOS version. These instructions are for Macs running macOS 10.14 "Mojave" or older"
Change or reset the password of a macOS user account in macOS Mojave or earlier - Apple Support