Trying to erase a MacBookPro (2017 model running Monterey 12.3) . When I restart and hold Command R, I get a closed lock icon and space to enter a password. If I enter my administrator password, (the dots disappear and) nothing happens; screen remains blank other than lock icon and space to enter password. (Have transferred all files, signed out of iCloud etc).
MacBook Pro
Essentially you need to do this: What to do before you sell, give away, or trade in your Mac - Apple Support
this will bring your Mac ack to its out-of-the-box condition: erased and ready to run setup.
It sounds like your Mac has a firmware password set: If your Mac doesn't start up all the way - Apple Support
Page down to the padlock screen section.
Also: Set a firmware password on your Mac - Apple Support
If you forgot your firmware password
If you can't remember your firmware password, schedule an in-person service appointment with an Apple Store or Apple Authorized Service Provider. Bring your Mac to the appointment, and bring your original receipt or invoice as proof of purchase.
Erase Mac
