First, select the right display
- Open Windows Settings → System → Display → Advanced display.
- Choose the monitor you want to change, then choose an offered refresh rate.
- If the expected rate is absent, verify the native resolution and continue with the connection checks below.
Follow the signal path
Check which monitor input is actually in use. Compare its mode table, not just the highest number on the product box. Confirm the cable category. If a hub, converter or dock is present, its specifications and port sharing add another limit that the direct-cable tool does not calculate.
Check the exact monitor revision and graphics-card board name. Some maximum monitor settings require an overclock option in the monitor menu. Our result flags that condition when the researched mode requires it. A similarly named product is not evidence for your own hardware.
Separate a missing setting from a fault
A missing high-refresh option is not enough to diagnose a damaged monitor. Record the selected resolution, input, cable marking and available rates. Compare them with official manuals. If a supported setting causes blanking or instability, return to a stable offered rate and use the manufacturer’s support guidance.
Connection checker