Have you ever found yourself staring at a blue screen when you start up your Mac? Well it might mean that one of your startup items — apps that start automatically when you start up your Mac — is incompatible with MacOS. With a bit of trial and error, you can identify which app is the problem child.
You can remove login items one at a time and start up your Mac after each removal to see if the problem is gone. To do so, go to System Preferences > Users & Groups and click your name on the left under Current User. Next, click the Login Items tab above the window to the right. Highlight an app and then click the “-” sign below. It’ll get removed from the Login Items list and you can restart your Mac to see if your startup issue has been fixed. If not, you can head back to the list and remove another app and keep going until you find the culprit. You can add items back to the Startup Items list by hitting the “+” button and selecting items from your Applications folder.