You have accidentally activated the MacBook VoiceOver… It is annoying, i had the same experience as well…
Don’t panic worry we have a solution for you and it is really simple.
MacBook VoiceOver has becomes really handy to assist Mac users who can not see – while screen readers for Windows cost hundreds of dollars, Mac has it build for their users without any additional cost. Sometimes users who have ability to see can occasionally turn it on without meaning to and the results can be uncomfortable.
If your Mac starts talking to you while reading everything on-screen with a thick black line around everything and possibly also the black box or caption bar at the bottom of the screen; all you have to do is to disable this command-F5 shortcut, so if it doesn’t work you’ll need to follow these steps:
Step by Step
- Choose “System Preferences” from the Apple () menu at the top left corner of the screen.
- Click on the “Accessibility” icon in System Preferences, then the “VoiceOver” item in the list on the left.
- Remove the check mark on the “Enable Macbook VoiceOver” box.
If above steps are not clear then you can watch how one of the user did this in the following video.