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Issue: I plugged in a second screen and it's black or "No Signal."
Issue: I plugged in a second screen and it's black or "No Signal."
Use the "Detect Displays" Feature, sometimes Mac needs a nudge to look for the monitor.
Go to the Apple Menu > System Settings.
Click on Displays.
If the monitor isn't showing up, press and hold the Option (⌥) key. A "Detect Displays" button will appear in the bottom right of the window. Click it.
Refresh the Connection
Unplug the HDMI or USB-C cable from the Mac.
Wait at least 5 seconds, and plug it back in firmly. If you are using a hub/dongle, try plugging the dongle into a different port on your Mac.
Graphics Driver Reset
If the screen is still black, press Windows + Ctrl + Shift + B.
You will hear a beep— this restarts the graphics driver and often forces the monitor to wake up.
Issue: Your mouse is not crossing on the other screen.
Issue: Your mouse is not crossing on the other screen.
Arrange Monitor Display
Click the Apple Menu > System Settings
Click on Displays.
Click the Arrange button
A window will appear showing your active monitors. Click and hold one of the boxes—a red border will appear on the physical screen so you know which one you are moving.
Click and drag the boxes so their positions match your physical setup
Align the edges, make sure the boxes are touching.
Click Done.
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