Why is the high refresh rate missing?
A monitor advertised as 165 Hz can still show only 60 Hz on a particular connection.
USB-C dock: no display or low refresh rate? A controlled checklist
Before you start
No picture or a missing high-refresh mode through a USB-C dock does not, by itself, prove a faulty monitor. Write the complete chain: computer → dock → cable → monitor input. Record exact device models and check their official video-mode documentation. The connector shape and successful charging are not enough to establish that the intended display mode is supported.
Controlled comparison
Where possible, connect the same monitor directly using an appropriate cable. In Windows, select the intended screen under Settings → System → Display → Advanced display and record resolution and refresh rate. Repeat through the dock with the same input and content. If two screens are connected, compare again with the second screen disconnected, changing nothing else. If a direct connection is unavailable, record that limitation rather than claiming the dock failed.
How to interpret the result
A mode that appears directly but disappears through the dock narrows the investigation to the connection chain; it does not identify a bad cable automatically. Screen count, resolution, colour depth and actual port capabilities matter together. Reduce just one screen’s resolution or refresh rate and check what becomes available on the other. A bandwidth estimate is not a compatibility certificate, and a version label is not a universal maximum-Hz promise.
What to record
Record the two connection results separately, with models, ports, cable markings, display count, resolution, Hz, HDR and colour depth. “60 Hz via the dock, 144 Hz directly at the same resolution” is more useful than “slow monitor.” Use the relevant manufacturer’s model page if drivers or firmware need attention. This checklist does not assume buying a new cable; first isolate the behaviour with the equipment available.
Sources and scope
Related checks
Cable bandwidth calculator
If your monitor only shows 60 Hz or 120 Hz instead of 144 Hz, 165 Hz, or 240 Hz, the bottleneck is often the HDMI or DisplayPort interface generation.
Monitor test report
Check a new or used monitor in a repeatable order, collect your observations in one place and export a text file or use your browser's print dialog to create a PDF.