iMac locked at start up
It's an old iMac. When I power off/power on, it shows a locked screen to enter password.
I'd like to re-install OS, but I can't get past the Lock Screen.
Any help appreciated!
iMac (2017 – 2020)
Question marked as
If your Mac doesn't start up all the way - Apple Support
Your iMac is firmware locked, you need to input the firmware password you used. If you no longer have it, your next stop is a trip to your local Apple Store or Apple Authorized Service Provider with a proof of purchase.