How to Disable Multiple Monitors
As long as a monitor is physically connected to a computer, it will be enabled. The computer will always output video information to that monitor, which the monitor will then display on screen. To disable multiple monitors on a computer and use only the primary monitor, you just need to physically disconnect all additional monitors from the computer.
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Instructions
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1
Shut down the computer. To avoid any unforeseen errors, plug in and unplug computer monitors only while the computer is off.
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2
Follow the video cable that connects the secondary computer monitor to the port where it is plugged into the computer.
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3
Unplug the monitor's video cable from the computer. This will disable the monitor.
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4
Repeat Steps 2 and 3 to disable any additional monitors plugged into the computer.
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