Likely fix
Fix: Monitor says no signal with adapter
No signal with an adapter usually means the adapter is the wrong direction, the port does not output video, or the adapter does not support the resolution or refresh rate.
Quick answer
Check adapter direction first. DisplayPort to HDMI is not the same as HDMI to DisplayPort, and USB-C to HDMI only works if the USB-C port supports video output.
Important warning
Some adapters look reversible but are not. Direction matters for DisplayPort, HDMI, VGA, and many USB-C setups.
Try this
- 1 Check which device is sending video and which device is receiving it.
- 2 Confirm the adapter is made for that direction.
- 3 If using USB-C, confirm the USB-C port supports video output.
- 4 Try a lower resolution or refresh rate.
- 5 Try another cable.
- 6 Try connecting without the adapter if possible.
- 7 Use an active adapter if the connection requires signal conversion.
Common causes
Adapter is the wrong direction.
USB-C port does not support video output.
Passive adapter used where active conversion is needed.
Resolution or refresh rate is too high for the adapter.
Dock or hub does not support video.
What to check next
- Check whether you need HDMI to DisplayPort or DisplayPort to HDMI.
- Check whether your USB-C port supports DisplayPort Alt Mode or Thunderbolt.
- Check whether the adapter says active or passive.
- Check whether the monitor works with a direct cable.
- Check whether a lower refresh rate works.
This might need a cable or adapter
If this fix points to a cable issue, check the related cable guide before buying the wrong one.
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