To fix a laptop screen on a MacBook, you may need to disable AutoBoot. Open Terminal on your Mac and type 'sudo nvram AutoBoot=%00' and press Return. Enter your password to confirm the action. This step may not be necessary for Macs running a more recent operating system, but if you disconnect the battery after unscrewing the bottom of your MacBook, you can still proceed with the fix. It's important to note that this procedure is for MacBook models from 2016 to early 2020 running macOS Catalina or earlier.