Apple has a detailed set of instructions on its site, but the outline is: This allows a Mac to mount like a hard drive on other Macs. If all else fails, Target Disk Mode may save the day. With Screen Sharing enabled, if you also clicked Computer Settings and enabled a password for VNC viewers, you should also or instead be able to use standard VNC screen-sharing software from any computer on the network (including a Mac), or one that can reach the network remotely. If that appears, click it, and enter the account information in the Screen Sharing app that launches. Does Share Screen appear in the upper-right corner of the Finder window? In the Finder on any other Mac on the same network look in the Locations section in the sidebar in any window. If you might have done so, follow these steps: MacOS allows remote screen access via a local network using Bonjour, but only if you enabled Screen Sharing in the Sharing preference pane. If any of that works, you can continue to use the Mac normally, or use the second display to manage transferring data from it. Try restarting the Mac and then reset its NVRAM or PRAM per Apple’s instructions at startup. With a Mac laptop, shut the computer’s lid, which may transfer the display to the external monitor. Even if you can’t see it, you might be able to grab the top of the window with the cursor on the monitor that’s invisible to you and drag it to the monitor you can see! It’s a little like those terrible claw toy machines-but without being able to even see the claw or the toy. See if you can bring up the Displays preference pane and check the Mirror Displays box in the Arrangement tab.
If the external monitor shows the image of a second screen instead of a mirror of the internal display:
If you’re lucky, the monitor is enabled with display mirroring, so you see exactly on the monitor what would appear on the internal display. (If you can’t see the display well enough to select Shut Down, press and hold the power button until it powers down, which is about 10 seconds.) Determine your Mac model and the kind of monitor and cable you need.
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