Laptop external monitor not detected
4.5
Connecting an HDMI or DisplayPort cable does not show an image on the second screen.
Symptoms
- No signal
- Monitor black
- Display settings empty
Possible Causes
- Bad cable
- Wrong input source
- Port failure
Step-by-Step Fix
1
Press Win+P
Ensure the display mode is set to "Extend" or "Duplicate".
2
Check Monitor Input
Manually select HDMI/DP on the monitor's physical buttons.
3
Try Different Cable
Rule out a faulty HDMI or Thunderbolt cable.
When to See a Technician
Some USB-C ports do not support video output; look for the DisplayPort (D) icon.
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