Most Mac Laptops will require a video adapter out from your laptop to the HDMI cable input on the classroom monitors or projectors.You should now be seeing the same image on both your laptop screen and on the monitors or Projectors in your classroom.If you do not see two displays then you might need to retry the TroubleShooting steps above. Then select Displays then select Arrangement.Under the Apple menu, upper left-hand corner select System Preferences.In most cases, choose Duplicate by using the arrow keys or cursor, then press enter. A list of four choices will appear on the right-hand side of the screen.
If you do see the two monitors and then select ‘Duplicate These Displays’ from the Orientation drop-down menu.If not please repeat the basic trouble-shooting listed above. In the Advanced Display Settings, you should see two monitors shown side by side.When you see the System Page, click Advanced Display Settings in the screen bottom-right corner.Click the Start button in the lower left-hand corner, then click on the System Icon.If nothing is still showing you might need to check the settings on your laptop.If you turned off the projector, you may need to wait a few minutes before the system will allow you to try turning it back on.Sometimes there is too much going on in the background, or too many applications are running. With your laptop properly connected and the correct source selected reboot your laptop.Switch to another source (like the Doc Cam), wait a few seconds, then switch back to Laptop HDMI.Verify the Projector or monitor is turned on and is the proper connection (Laptop HDMI) selected.Check the HDMI cable: Is it damaged? Reseat it securely to your laptop (or adaptor) HDMI output.
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