Find a monitor Windows does not detect

A missing monitor can result from a cable, input setting, unsupported connection or software state. Test one screen through the shortest supported path before rebuilding a multi-monitor setup. This separates failure to detect a display from a desktop that is detected but configured incorrectly.

Check the monitor before changing software

Microsoft's external-display troubleshooting starts with updates, a monitor power reset and the selected video input. A monitor connected by DisplayPort must be listening to that input. Windows plus P then confirms that the intended projection mode is active. Reseating the adapter and testing another screen can identify a faulty conversion device.

Treat daisy chaining as a supported feature

The guide gives a DisplayPort daisy-chain example that uses a first monitor with an output port and compatible displays configured for DisplayPort 1.2 Multi-Stream Transport. This is a specific supported arrangement, not a feature of every DisplayPort screen. Follow the monitor manufacturer's instructions and port-version settings when configuring the chain, and check cable quality before assuming a driver problem.