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Start with Windows’ refresh-rate setting
Windows 10 and Windows 11 expose the refresh rate for each connected display. The setting applies to the monitor selected on the Advanced display page, so check the correct screen when more than one monitor is connected.
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- Open Settings.
- Go to System > Display.
- Select the monitor that is running at 60Hz.
- Open Advanced display.
- In the refresh-rate menu, choose 240Hz.
- Apply or keep the change when Windows asks for confirmation, then verify the displayed refresh rate on the same page.
The menu only lists modes Windows detects as supported by the display and its current connection. A rate marked with an asterisk does not support the current resolution, according to Microsoft’s Windows display guidance. If 240Hz is not listed, changing the setting repeatedly will not create a mode that the monitor, port, graphics device, or cable cannot carry.
If the menu changes back to 60Hz after you select 240Hz, note exactly what Windows reports before trying another change. A mode that appears briefly and then disappears can indicate that the selected input, adapter, dock, or cable cannot sustain that combination. Reopen Advanced display after each physical change so you are testing the newly negotiated connection rather than an old result.
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What a 60Hz reading actually tells you
A 60Hz reading means the active output mode is 60 refreshes per second. It does not by itself prove that the monitor is faulty. A 240Hz panel can still be limited to 60Hz when Windows is using the wrong display, the selected resolution has no 240Hz mode, the signal is connected to a restricted input, or an adapter, dock, cable, or graphics output cannot negotiate the required bandwidth.
Refresh rate and frame rate are also different measurements. Refresh rate is the monitor’s display timing; frame rate is how many frames an application renders. A monitor can be receiving 240Hz while a game renders 60 frames per second. Conversely, a game may render more frames than a 60Hz link can display. Check both Windows and the monitor’s own status screen before deciding which part of the system is limited.
The wrong monitor is selected
Windows keeps a separate refresh-rate choice for each display. With a laptop screen, television, or second monitor attached, the Advanced display page can open on a different screen than the one you intend to use. Confirm the monitor name and physical screen before changing the rate. If two displays have similar names, temporarily disconnect the other one or identify the screen by its position in Settings > System > Display.
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Refresh-rate choices depend on resolution. A monitor may offer 240Hz at one resolution but only 60Hz or 120Hz at another. Windows marks a rate that is incompatible with the current resolution with an asterisk, and the monitor’s manual is the authoritative list of supported resolution-and-refresh combinations for that model.
Do not assume that lowering or raising resolution will always produce 240Hz. Set a documented combination from the manual, then check whether Windows offers the rate without an asterisk. Features such as HDR, a particular color bit depth, or a compression mode can also be tied to specific input limits, so compare the full mode rather than looking at the refresh number alone.
The monitor is on the wrong input
Many monitors have separate HDMI and DisplayPort inputs with different limits. A 240Hz specification on the product page does not mean every input, resolution, color mode, or connected computer can reach 240Hz. Select the input listed in the manual for the desired mode and check the monitor’s on-screen display (OSD) to see the refresh rate it is actually receiving.
Use the monitor’s input selector to make sure it is displaying the connector you are testing. If the monitor is set to HDMI while the cable is connected to DisplayPort, Windows may identify a different path than you expect or show only the modes available on the active connector. Input labels such as “PC” can matter on some models; follow the exact model’s instructions instead of copying settings from a different display.
A complete diagnostic sequence
Work through these checks in order. Each step eliminates a different limitation and prevents buying a cable before you know what the setup requires.
1. Record the exact setup
- Monitor make, model, and firmware or model revision if the manufacturer lists one.
- Current Windows version: Windows 10 or Windows 11.
- Resolution selected in Windows.
- Graphics hardware: discrete graphics card or integrated graphics, plus the computer model if it is a laptop.
- Signal path: DisplayPort, HDMI, USB-C, adapter, dock, or hub.
- Which monitor input is physically connected.
These details determine whether 240Hz is available. Without the exact model and connection path, no single cable or port recommendation is reliable. Write down the current Windows rate and the OSD rate before changing anything; having both values makes it easier to tell whether a change affected the computer output or only the monitor input.
2. Check the monitor’s OSD input rate
Open the monitor’s information, signal, or input-status page. Manufacturers commonly show the incoming resolution and refresh rate there. Compare that value with Windows’ Advanced display page:
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- If both Windows and the OSD show 60Hz, the computer is sending a 60Hz mode or the link is limited to one.
- If Windows offers 240Hz but the OSD remains at 60Hz, recheck the selected input, cable path, and any adapter or dock.
- If the OSD shows about 240Hz while a game appears capped at 60 frames per second, the desktop link is working and the remaining issue is likely in the game or Windows gaming configuration rather than the monitor’s negotiated refresh rate.
An OSD value close to 240Hz may be displayed as 239.97Hz or a similar timing. That is the same documented class of high-refresh mode for troubleshooting purposes; use the exact value and notation shown in the manual and Windows rather than treating a small decimal difference as a failure.
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Look up the manual for the exact monitor model, not a similar model in the same product family. Find the table that pairs resolution, refresh rate, and input. Some manuals list separate limits for HDMI, DisplayPort, USB-C, HDR, and compression modes. Set Windows to one of those documented combinations before testing again.
For example, LG support documentation gives an example of 2560 × 1440 at 239.97Hz using HDMI 2.1 (PC) or DisplayPort 1.4 with DSC, but it explicitly notes that supported modes vary by model. That example cannot establish the correct port for another monitor. The model manual should take priority over a retailer listing, a cable description, or a forum recommendation.
Check whether the manual distinguishes a PC input from a console-oriented HDMI input. Also note whether the listed rate depends on a particular display-stream-compression setting. These distinctions explain why two ports that look identical can expose different choices in Windows.
4. Verify the graphics output
The graphics card or integrated graphics processor must support the selected resolution and 240Hz mode on the output you are using. Desktop users should connect the cable to the graphics card’s output when a discrete card is installed, rather than a motherboard video port that may be disabled or limited. Laptop users must check whether the USB-C, HDMI, or DisplayPort output is wired to the capable graphics device; the laptop’s manual is needed to establish that.
PC performance can also affect which modes a manufacturer documents as supported. A monitor’s advertised maximum is not a guarantee that every computer can produce it. If a desktop has several video outputs, test the connector specified by the monitor manual and graphics-device documentation rather than assuming all outputs are equivalent.
When comparing a laptop dock, integrated graphics output, and discrete graphics output, treat each as a separate signal path. A 240Hz-capable monitor connected through one path does not prove that another path can provide the same resolution and refresh rate.
5. Test the cable and remove conversion hardware
Match the cable connector and capability to both ends of the link. A cable can be a bottleneck when it is damaged, poorly made, too long for the required signal, or below the monitor’s documented specification. Test with a known-good cable that meets the exact manual’s requirement and connect directly from the computer to the monitor.
Temporarily remove KVM switches, splitters, docks, and USB-C hubs. Each device can impose its own bandwidth or mode limit. If 240Hz appears after bypassing one, that device—not the panel—is restricting the signal. Restore devices one at a time so you can identify which part changes the available mode.
LG’s support guidance recommends using the cable supplied with its UltraGear monitors and warns that separately purchased cables can cause problems. Treat that as model-specific advice, not a universal rule that every 240Hz monitor requires an LG-supplied cable. A higher-numbered cable standard is not automatically necessary; the correct choice is the one whose documented capability covers the exact mode at both ends.
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Inspect both connectors for a loose fit and test the cable without an extension or converter. If a known-good direct cable produces the same 60Hz limit, continue checking the input, output, resolution, and manual before purchasing another accessory.
6. Diagnose USB-C connections separately
USB-C is a connector shape, not a guarantee of high-refresh video. The computer, its specific USB-C port, the monitor, and the cable must all support DisplayPort Alternate Mode at the required bandwidth.
- Check the computer specifications for DisplayPort Alternate Mode on the exact USB-C port.
- Check the monitor manual for the USB-C input’s supported resolution and refresh rate.
- Use a USB-C cable rated for the video mode required by both devices.
- Connect directly to the computer while diagnosing; bypass the dock or hub.
- After reconnecting, return to Settings > System > Display > Advanced display and check whether 240Hz is now offered.
Microsoft recommends a direct connection and a port that supports the relevant Alternate Mode when troubleshooting USB-C display output. Do not infer video capability from charging or data-transfer capability alone: a USB-C port can power a device or carry data without carrying the DisplayPort signal needed for 240Hz.
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7. Test Windows 11 Dynamic Refresh Rate
Windows 11’s Dynamic Refresh Rate (DRR) can change the operating refresh rate according to activity. Microsoft says DRR requires a variable-refresh-rate-capable display and a refresh rate of at least 120Hz. If a game appears to run at a lower refresh rate while DRR is enabled, turn DRR off temporarily and test again.
This is a targeted test for a Windows 11 gaming symptom; it does not fix a missing 240Hz mode in Advanced display. If the desktop itself is fixed at 60Hz, return to the monitor, resolution, input, graphics-output, and connection checks instead of treating DRR as the primary cause.
Use the symptom to choose the next fix
| What you observe | Most useful next check |
|---|---|
| 240Hz is absent from Advanced display | Confirm the selected monitor, current resolution, manual-supported modes, graphics output, input, and cable path. |
| 240Hz is listed with an asterisk | Change to a resolution that the manual documents at 240Hz, or use the documented input and connection mode. |
| Windows shows 240Hz but the monitor OSD shows 60Hz | Check the physical input, adapter or dock, cable, and the computer output port. |
| The desktop is 240Hz but one Windows 11 game appears lower | Test with Dynamic Refresh Rate disabled. |
| 240Hz works when a dock or hub is removed | The dock or hub is limiting the video mode; use a direct connection or a device whose specifications include the required mode. |
| Only USB-C fails to reach 240Hz | Verify DisplayPort Alternate Mode support on the computer, port, monitor, and cable. |
| A different input reaches 240Hz | Use the input identified by the manual for the desired resolution, refresh rate, and optional HDR or bit-depth settings. |
| A direct known-good cable still shows 60Hz | Recheck the exact monitor model’s mode table and the graphics device output before escalating to support. |
HDMI, DisplayPort, and cable bandwidth: what can and cannot be generalized
There is no universal HDMI-versus-DisplayPort answer for an unidentified monitor. Compare the monitor input, computer output, resolution, refresh rate, HDR setting, and color bit depth with the model manual. The connector that works for one 240Hz monitor may not provide the same mode on another.
In an LG UltraGear example, support documentation names HDMI 2.0 or higher and DisplayPort 1.4 or higher for certain high-refresh configurations, while another example specifies 2560 × 1440 at 239.97Hz through HDMI 2.1 (PC) or DisplayPort 1.4 with DSC. Those are examples from that manufacturer’s model-specific guidance, not a rule for every 240Hz display.
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VESA’s February 28, 2022 certification announcement describes UHBR bandwidth capable of uncompressed 4K at 240Hz with HDR and defines DP40 and DP80 cable certification categories. This is a standards capability example. It does not mean every 240Hz monitor needs a DP40 or DP80 cable. The DisplayPort FAQ notes that many displays do not need the highest available link bandwidth to reach their maximum resolution and refresh rate.
Buy or replace a cable only after the manual identifies the required mode and you have ruled out the selected display, resolution, input, graphics output, and dock. If you do replace it, match the connector at each end and choose a cable whose documented capability covers the target mode. VESA’s certified-components listing is a way to verify certification categories, but certification alone does not choose the correct cable for an unknown monitor.
There is no fixed “240Hz cable” that guarantees success in every setup. The required capability depends on resolution and other enabled signal features. A cable purchase is justified when the existing cable is damaged, its specification is below the documented requirement, or the mode works after switching to a known-good compliant cable.
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When the monitor is probably not the problem
A monitor is less likely to be defective when 240Hz becomes available after changing the resolution, selecting another input, bypassing a dock, or using a direct cable. It is also unlikely to be the panel when the OSD reports 240Hz but a single game reports 60 frames per second; refresh rate and game frame rate are separate measurements.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsEscalate to the monitor manufacturer only after confirming the exact model’s documented mode, using a direct connection from a capable graphics output, testing a known-good compliant cable, and checking the OSD. Provide the manufacturer with the model, resolution, input, graphics hardware, cable type, and the OSD reading so support can reproduce the same signal path.
If no documented input supports 240Hz at your chosen resolution, the display may be operating normally even though its headline specification says 240Hz. In that case, use the supported resolution or input, or ask the manufacturer whether a different documented mode is required. Do not treat an advertised maximum as proof that every port and computer combination can achieve it.
Final verification checklist
- The intended monitor is selected in Advanced display.
- The current resolution is one the manual documents at 240Hz.
- Windows is set to 240Hz without an incompatibility asterisk.
- The monitor OSD reports the expected incoming refresh rate.
- The cable is connected to the correct monitor input and computer output.
- Any dock, hub, splitter, or adapter has been bypassed during testing.
- USB-C systems support DisplayPort Alternate Mode on every part of the path.
- Dynamic Refresh Rate has been tested off when the problem occurs only in a Windows 11 game.
- The final test uses the same resolution, input, HDR or bit-depth options, and direct connection documented for the target mode.
Frequently asked questions
Why does my 240Hz monitor only show 60Hz?
Windows may be set to 60Hz, the wrong monitor may be selected, or the current resolution and input may not support 240Hz. A restricted graphics output, cable, adapter, dock, or USB-C path can also limit the mode. Check Advanced display first, then compare the monitor OSD with the exact model manual.
Why is 240Hz missing from Windows?
Windows lists only modes it detects as supported for the selected display and connection. Check the current resolution, the manual’s input-specific mode table, the graphics output, and the direct cable path. If the rate appears with an asterisk, it is not supported at that resolution.
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Should I use HDMI or DisplayPort for 240Hz?
Neither connector is universally correct. The answer depends on the monitor input, computer output, resolution, refresh rate, HDR, and color settings. Use the port and standard identified by the exact monitor manual; LG examples include different requirements for different models and modes.
Do I automatically need a DP40, DP80, or DisplayPort 1.4 cable?
No. VESA describes DP40 and DP80 capabilities for high-bandwidth DisplayPort links, including an example of uncompressed 4K at 240Hz with HDR, but the DisplayPort FAQ notes that not every display needs the highest bandwidth. Match the cable to the mode documented for both devices.
Can a USB-C cable provide 240Hz?
It can only when the computer’s specific USB-C port, the monitor, and the cable all support DisplayPort Alternate Mode at the required bandwidth. Connect directly to the computer and bypass a dock while testing. Charging or ordinary USB data support does not establish video support.
The OSD says 240Hz, but my game says 60 FPS. Is the monitor still working?
Probably. The OSD measures the incoming display refresh rate, while the game’s counter measures rendered frames. If the Windows desktop and OSD show about 240Hz, investigate the game or Windows gaming configuration. On Windows 11, test with Dynamic Refresh Rate disabled if the lower rate occurs only in a game.
Should I buy a new cable immediately?
No. First confirm the selected monitor, resolution, manual-supported input, graphics output, and any dock or adapter. Then test a known-good cable that meets the documented requirement. Replace the cable when its capability or condition is a plausible bottleneck, not simply because the monitor is advertised as 240Hz.
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When should I contact the monitor manufacturer?
Contact support after a direct connection from a capable graphics output, a documented resolution and input, and a known-good compliant cable still fail to provide the listed mode. Include the model, resolution, input, graphics hardware, cable type, Windows setting, and OSD reading so the signal path can be reproduced.
Frequently Asked Questions
Why does my 240Hz monitor only show 60Hz?
Windows may be set to 60Hz, the wrong monitor may be selected, or the current resolution and input may not support 240Hz. A restricted graphics output, cable, adapter, dock, or USB-C path can also limit the mode. Check Advanced display first, then compare the monitor OSD with the exact model manual.
Why is 240Hz missing from Windows?
Windows lists only modes it detects as supported for the selected display and connection. Check the current resolution, the manual’s input-specific mode table, the graphics output, and the direct cable path. If the rate appears with an asterisk, it is not supported at that resolution.
Should I use HDMI or DisplayPort for 240Hz?
Neither connector is universally correct. The answer depends on the monitor input, computer output, resolution, refresh rate, HDR, and color settings. Use the port and standard identified by the exact monitor manual.
Do I automatically need a DP40, DP80, or DisplayPort 1.4 cable?
No. Those are bandwidth capabilities, not universal requirements. Match the cable to the mode documented for both devices.
Can a USB-C cable provide 240Hz?
Only when the computer’s specific USB-C port, monitor, and cable all support DisplayPort Alternate Mode at the required bandwidth. Connect directly to the computer and bypass a dock while testing.
The OSD says 240Hz, but my game says 60 FPS. Is the monitor working?
Probably. The OSD measures incoming refresh rate, while the game counter measures rendered frames. On Windows 11, test with Dynamic Refresh Rate disabled if the lower rate occurs only in a game.
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Should I buy a new cable immediately?
No. Confirm the selected monitor, resolution, manual-supported input, graphics output, and dock or adapter first. Then test a known-good cable that meets the documented requirement.
When should I contact the monitor manufacturer?
After a direct connection from a capable graphics output, a documented resolution and input, and a known-good compliant cable still fail to provide the listed mode. Include the model, resolution, input, graphics hardware, cable type, Windows setting, and OSD reading.
The Bottom Line
Set the correct monitor to 240Hz under Advanced display. If Windows does not offer it, match the manual’s resolution and input, verify the graphics output, bypass docks and adapters, and test a compliant direct cable. For USB-C, confirm DisplayPort Alternate Mode across every component; for a Windows 11 game that alone drops lower, test with DRR disabled. The monitor is unlikely to be defective when its OSD and a direct documented connection show the expected rate.
Quick Recap
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