When I start my MacBook Air, an empty/blank window appears. Does anybody know how to get rid of or repair it so that when I boot up it doesn´t appear? There is nothing else wrong with it, I can just close the empty window and everything is fine.
I have solved the problem by reinstalling latest OS. Follow these steps to do it :
- Shut down your Mac first
- Restart and keep cmd+R buttons pressed until Apple Logo shown
- Choose from the menu reinstall OS (in my case : Reinstall Sierra)
- Follow on screen instructions.
Reinstalling latest OS doesn't change or delete your current settings or installed softwares.
You might consider using Activity Monitor to tell you which application is opening the window and take it from there. In Activity Monitor.app, select "Windowed Processes" from the drop-down Process filter menu in the app's toolbar. Being as you've just logged in, I doubt you will have many prospects to choose from and the task should be simple enough.