How to Fix Windows 11 External Monitor Not Detected

If Windows 11 does not detect a second monitor, check the cable, monitor input, graphics driver, and display settings.

## Method 1: Check the cable and input
Make sure the monitor is powered on, reconnect the HDMI or DisplayPort cable, select the correct monitor input, and test another cable or port if possible.

## Method 2: Detect the display
Open Settings > System > Display > Multiple displays and select Detect. If the monitor appears, choose Extend or Duplicate.

## Method 3: Reset the graphics driver
Press Windows + Ctrl + Shift + B. The screen may briefly flicker. Wait a few seconds and check again.

## Method 4: Check projection mode
Press Windows + P and choose Extend or Duplicate.

## Method 5: Update the graphics driver
Open Device Manager > Display adapters and check the graphics device. Update it or use the current driver from the GPU manufacturer’s official support page.

## Method 6: Test the monitor elsewhere
Connect the monitor to another computer. If it works there, investigate the original PC’s cable, port, settings, or driver.

### Final tip
On a desktop with a dedicated graphics card, connect the monitor to the graphics card outputs rather than the motherboard outputs when appropriate.