Windows 11 Not Detecting Second Monitor

Short answer: If your external display isn't detected, check cables and use Display settings.

TL;DR: quick fix

Check the cable and try a different port or cable.
Open Settings > System > Display and select Detect.
Press Win+Ctrl+Shift+B to reset the graphics driver.

Is Windows 11 down?

Windows 11 has no public status page. If friends on other networks see the same problem, it's probably an outage: wait and retry.

How to fix it: step by step

Check the cable and try a different port or cable.
Open Settings > System > Display and select Detect.
Press Win+Ctrl+Shift+B to reset the graphics driver.
Update or roll back the display driver.

FAQ

Does the monitor need its own power?

Yes, make sure it's powered on and set to the right input.

More Windows 11 fixes

Windows 11 Not Connecting to Wi-Fi: Fixes
Windows Update Failed or Stuck: Fix

Last checked Oct 2026 against the official help page: Microsoft Support. Menus can differ by app version; follow the official page if a step doesn't match.