How to fix support apple.com/mac/startup?

Boot problem MacBook Pro A1990 - Apple Community

How to Start Up a Mac in Internet Recovery Mode - iFixit Repair Guide

If your Mac starts up to error -1008F - Apple Support

Fix Support.apple.com/mac/startup -1005F/1008F/2002F/2005F

What to do if your Mac won't boot up: fixing Apple startup issues

My mac dosent work, it says i need to visit support.apple.com/mac

Receive Error -2003F When Reinstalling macOS on Mac?

How to fix support apple.com/mac/startup

Fix Support.apple.com/mac/startup -1005F/1008F/2002F/2005F