How to Fix Your Mac's Gray Desktop Background Image Issue

How to Fix Your Mac's Gray Desktop Background Image Issue

Zach Zach (199)
Total time: 2 minutes 

I hooked up my external monitor today and found that its desktop background had been replacement by a grey image. I tried going into System Preferences and setting the background image again but it remained grey. Here's how to fix the problem when it occurs.

Navigate to Applications > Utilities > Terminal.

killall Dock

This command will restore your background image.