Lets try going in and making sure you have your displays set properly, as it sounds like you have it set to closed display mode.
First, shut down the mac. Then, disconnect the external display.
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R.
Turn on your Mac.
Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
Hold these keys until the computer restarts and you hear the startup sound for a second time.
Release the keys.
Once the mac fully boots. Follow these steps next
Here's how to set up an extended desktop:
- Connect and turn on your additional display.
- From the Apple () menu, choose System Preferences.
- Choose Displays.
- Click the Arrangement tab.
- Make sure that the Mirror Displays checkbox isn't selected.
If this doesnt work and get both screens going, let me know. And if it does work, please remember to return here and click and submit a 5 star rating to show I was able to assist you.
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied.. I always answer follow up questions.
Senior Technician and Network Switching Systems Operator / Maintainer.