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What to Do When Windows Does Not Detect a Second Monitor

Troubleshoot an external display that remains blank or missing.

Quick Answer

Check power and cable/input selection, then use Settings → System → Display → Multiple displays → Detect.

Step by Step

  1. Check power, cables, wireless connection, and any physical switches or indicators first.
  2. Check power and cable/input selection, then use Settings → System → Display → Multiple displays → Detect.
  3. Test the device again before making additional changes.
  4. If the problem remains, check Windows Settings and Device Manager, then use the manufacturer's official support information for the exact model.

If That Doesn't Work

  • Change one thing at a time so you know which action fixed or caused the problem.
  • Avoid downloading drivers or device utilities from unofficial driver-download websites.