_:n7a135b992d124754a29c89d3cfbc3759xb27
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"Make sure the monitor is connected and turned on. You can skip this step if you're using a Mac laptop with its own built-in monitor. If you have a Mac desktop, make sure the monitor is securely plugged into the correct port and that it's turned on.\nIf you're using a TV as a monitor, make sure it is set to the correct source or input. For example, if your Mac is connected to your TV's HDMI-2 port, you'll usually have to use the TV remote control to switch the source/input to HDMI-2."
<https://www.wikihow.com/Turn-On-a-Mac-Computer>