Desktop — On the back of the desktop’s tower, look for a free video output port. If you see one next to or directly above the port that’s currently being used to connect your desktop to the primary monitor, you can use a second monitor. Laptop — Any laptop with a video output port (e. g. , HDMI, DisplayPort, or USB-C) can support a second monitor.
If you have a free video output connection which matches a connection on the back of your second monitor, it’s best to use a cable that fits both connections. If your computer uses a different connection than your monitor, you can buy an adapter cable (e. g. , USB-C to HDMI) or unit (e. g. , VGA to HDMI).
If you’re duplicating your primary monitor, it doesn’t matter where you place your second monitor.
If you’re using an adapter unit, you may need to plug both cables into the adapter and/or plug the adapter into a power source before you can connect the monitor to your computer.
Duplicate these displays — Copies what’s on your computer’s primary screen to the second monitor. Show only on 1 — Blacks out the second monitor and displays only on your primary monitor. Show only on 2 — Turns off your primary monitor and displays only on your second monitor. Depending on your second monitor, you may have additional options here.
Duplicate these displays — Copies what’s on your computer’s primary screen to the second monitor. Show only on 1 — Blacks out the second monitor and displays only on your primary monitor. Show only on 2 — Turns off your primary monitor and displays only on your second monitor. Depending on your second monitor, you may have additional options here.