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If your 240Hz monitor is stuck at 60Hz, first select the correct display in Windows and change its refresh rate: Settings > System > Display > Advanced display, then choose 240Hz from the refresh-rate list. If 240Hz is missing, the usual causes are an incompatible resolution, the wrong monitor input, a graphics-output limit, or a cable, adapter, dock, or USB-C port that cannot carry the required signal.
Start with the Windows refresh-rate setting
Windows can default to 60Hz even when the monitor and graphics hardware support 240Hz. The setting is per display, so selecting the wrong screen is easy when several monitors are connected.
- Open Settings.
- Go to System > Display.
- Click the monitor that is running at 60Hz. Use Identify if you are unsure which numbered display corresponds to the 240Hz panel.
- Open Advanced display.
- In Choose a refresh rate, select 240Hz and apply the change if Windows asks for confirmation.
Windows 10 and Windows 11 expose the refresh-rate control through Advanced display, although the surrounding Settings layout can differ slightly by version. With multiple screens attached, select the affected monitor before opening the advanced controls; changing the rate for another display will not change the 240Hz panel.
Check the current resolution on the same page. Windows only lists refresh rates that it believes the selected display can use at that resolution and connection. A rate marked with an asterisk is not supported at the current resolution, according to Microsoft. Do not select it unless you are deliberately testing a different mode.
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If 240Hz is listed but you keep getting 60Hz after selecting it, wait for the display to switch modes, then reopen Advanced display and verify the value. A temporary black screen during a mode change is different from a persistent loss of signal. If Windows returns to 60Hz, continue with the input and link checks below.
After changing the setting, move the pointer, open a scrolling web page, or drag a window. The motion should look noticeably smoother. For a definitive check, read the monitor’s own on-screen refresh-rate indicator rather than relying only on the Windows label.
Check what the monitor itself is receiving
Most gaming monitors have an on-screen display (OSD) that reports the active input resolution and refresh rate. Open the monitor’s menu with its joystick or buttons and look for Information, Input, Signal, or a similarly named status page. The exact label differs by model.
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- If the OSD says 240Hz while Windows says 60Hz, Windows may be displaying a stale value, or you may be checking a different monitor. Re-select the intended screen in Advanced display.
- If both Windows and the OSD say 60Hz, the limit is somewhere in the output chain: resolution, graphics hardware, input selection, cable, adapter, dock, or monitor mode.
- If the OSD shows no signal information or repeatedly changes modes, treat that as a connection or stability problem before changing performance settings.
For an LG UltraGear display, LG specifically advises checking the monitor’s input refresh rate and then comparing it with Windows’ Advanced display setting. LG also warns that supported combinations vary by model, so the manual for the exact model is the authority.
The OSD is especially useful after changing ports. It confirms which physical input is active and whether the monitor negotiated the intended mode. Record the displayed resolution and rate before and after each change so you can identify which part of the signal path made a difference.
Confirm that 240Hz is supported at your chosen resolution
A monitor advertised as “240Hz” is not guaranteed to provide 240Hz at every resolution, through every input, or with every graphics device. Manufacturers publish a mode table that pairs each input with supported resolutions and refresh rates. Find the exact model number on the rear label, the monitor OSD, or the original documentation, then consult that model’s manual.
As an example of why the table matters, an LG support example lists 2560 × 1440 at 239.97Hz and identifies HDMI 2.1 (PC) and DisplayPort 1.4 with DSC for that particular example. Those values describe that example, not every 240Hz monitor.
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Read the table as a complete combination, not as separate promises. The monitor may support 240Hz at one resolution on DisplayPort, a lower rate on HDMI, and still lower rates when HDR or another color mode is enabled. The graphics output must support the same combination; the monitor’s maximum number alone cannot remove a limit elsewhere.
Test a lower resolution to isolate the limitation
- Return to Settings > System > Display and select the affected monitor.
- Temporarily choose a resolution explicitly listed in the monitor manual as supporting 240Hz.
- Open Advanced display and check whether 240Hz now appears.
If 240Hz appears at the test resolution but not at your preferred resolution, the monitor, input, or link is limited for that combination. Keep the supported mode, use a different input, or upgrade the limiting component rather than forcing an unsupported setting. If 240Hz is absent even at a manual-listed mode, focus on the graphics output, cable, adapter, or incorrect input.
Verify the graphics output and the monitor input
The graphics card or integrated graphics output must support the desired resolution and refresh rate. A powerful monitor cannot create a 240Hz signal if the computer’s output is limited to 60Hz at that mode.
- Connect the cable to the dedicated graphics card when the computer has one, rather than to a motherboard video output that may be disabled or have different capabilities.
- Use the monitor input named in its manual for the target mode. Some models expose different maximum rates on HDMI and DisplayPort, and some reserve a port for a particular feature.
- On a laptop, identify which physical port is wired to the discrete GPU and which is connected through integrated graphics. The manufacturer’s specifications determine what each port can output.
- Update the graphics driver if the correct display mode is missing or Windows identifies the monitor incorrectly. A driver update cannot exceed the physical limits of the port, but it can correct mode-detection problems.
Check both ends of the connection: the graphics card may have several outputs with different capabilities, and the monitor may have several inputs with different mode tables. Select the matching input in the monitor OSD after moving the cable. If a desktop has both motherboard and graphics-card outputs, use the output associated with the GPU that is rendering the display.
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Power off the computer and monitor before moving the cable between ports. After reconnecting, select the new input in the monitor OSD, then repeat the Windows refresh-rate check.
Inspect the cable, adapter, dock, and signal path
Every device between the graphics output and the monitor can restrict the available mode. A cable that works at 60Hz may not have enough bandwidth, may be damaged, or may be routed through an adapter that negotiates a lower standard.
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There is no universal “HDMI versus DisplayPort” answer for an unidentified monitor. Compare the exact monitor input, computer output, resolution, refresh rate, HDR or bit-depth requirements, and the manual’s mode table. In LG’s UltraGear guidance, some examples call for HDMI 2.0 or higher or DisplayPort 1.4, but LG explicitly says requirements differ by model.
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| What to compare | Why it matters |
|---|---|
| Monitor input version | The monitor may allow 240Hz on one input but not another. |
| Graphics-output version | The computer must provide the same required mode; a high-spec monitor input cannot compensate for a lower-spec output. |
| Resolution and refresh combination | Bandwidth rises with resolution, refresh rate, HDR, and color depth. |
| Connector and cable condition | A loose, damaged, or poorly seated connection can cause fallback to a stable 60Hz mode. |
| Adapters and converters | An adapter may support only 60Hz, even when both native ports support 240Hz. |
Use a direct connection while diagnosing. Remove KVM switches, capture devices, extension cables, docks, and passive adapters one at a time. If 240Hz returns when an intermediate device is removed, that device or its cable is the bottleneck.
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When replacing a cable makes sense
Replace or test the cable only after checking the monitor manual and both ports. Match the connector type and the required mode at both ends. A higher-numbered cable is not automatically necessary for every 240Hz display, and a premium cable cannot overcome a graphics output that lacks the required specification.
For a standards-based purchase, look for the capability specified by the monitor manufacturer and, where relevant, a certified component listing from VESA. Certification is evidence about the cable category; it is not proof that the cable is required for your particular monitor. Check that the listing describes the connector arrangement you need, since a cable certified for one connector path cannot replace a missing capability in the computer or display.
USB-C setups need DisplayPort Alternate Mode
USB-C is a connector shape, not a guarantee of high-refresh video. For USB-C video, the computer, its USB-C port, the display, and the cable must all support the required DisplayPort Alternate Mode (DP Alt Mode).
- Confirm in the computer specifications that the exact USB-C port supports DisplayPort video or DP Alt Mode.
- Confirm that the monitor’s USB-C input accepts the required resolution and 240Hz mode.
- Use a USB-C cable rated for the required video function; a charge-only cable cannot carry the display signal.
- Connect the monitor directly to the computer’s compatible port.
- Temporarily bypass a hub or dock. Microsoft recommends a direct connection during diagnosis because the dock may support only a lower refresh rate or resolution.
If direct USB-C works at 240Hz but the dock does not, check the dock’s video specifications and firmware. If direct USB-C also remains at 60Hz, test a native DisplayPort or HDMI output if the computer provides one. A USB-C port that supports charging or data does not necessarily support video, and a cable that fits physically can still lack the required display function.
Turn off Windows 11 Dynamic Refresh Rate when games are capped
Windows 11 Dynamic Refresh Rate (DRR) can change refresh behavior to balance smoothness and power use. Microsoft says DRR requires variable-refresh-rate support and a display refresh rate of at least 120Hz. If a game appears to run at a lower rate while DRR is enabled, test with DRR disabled.
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- Open Settings > System > Display > Advanced display.
- Select the affected monitor.
- Set Choose a refresh rate to 240Hz if available.
- If DRR is shown, turn it off temporarily.
- Restart the game and check its own frame-rate or refresh-rate indicator.
DRR is relevant when Windows offers 120Hz or higher but a game behaves as though it is using a lower rate. It does not make an unsupported cable, port, resolution, or monitor mode support 240Hz. If Windows itself offers only 60Hz, fix the display mode first; DRR is not the cause of a missing hardware mode.
Use the symptom to find the failing link
| Symptom | Most useful next check |
|---|---|
| 240Hz is listed and selectable, but the picture still looks like 60Hz | Read the monitor OSD, confirm the game’s frame-rate cap, and check whether V-Sync or an in-game limit is set to 60. |
| 240Hz is missing at the native resolution | Compare that resolution/input pair with the exact model’s manual; test the specified input and a direct cable. |
| 240Hz appears only after lowering resolution | The original resolution, input, graphics output, or link does not support 240Hz together. |
| The monitor works at 240Hz directly but not through a dock | Check the dock’s maximum resolution and refresh rate, or continue using a direct connection. |
| The rate drops after changing cables or ports | Confirm the monitor input selection and verify that the replacement cable and adapter support the required mode. |
| The screen flickers, blanks, or loses signal at 240Hz | Reseat the cable, remove adapters, test another supported cable, and use the manual’s recommended port before lowering settings. |
This symptom-based approach prevents unnecessary purchases. If a direct connection at a manual-listed mode works, the removed dock, adapter, or cable is implicated. If no tested path offers 240Hz, compare the graphics output and monitor specifications before assuming the panel is defective.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Do not confuse refresh rate with game frame rate
Refresh rate is how often the monitor can update its image; frame rate is how many frames the game or application renders. Windows and the monitor can be correctly set to 240Hz while a game produces 60 frames per second because of a frame-rate cap, V-Sync setting, graphics load, or CPU limitation.
First establish the monitor’s actual input rate in its OSD. Then inspect the game’s display settings for a 60 FPS cap, exclusive-fullscreen mode, V-Sync behavior, or a separate refresh-rate selector. A game rendering below 240 FPS is not evidence that the monitor has reverted to 60Hz. Conversely, selecting 240Hz does not guarantee that every game will render 240 frames per second.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the 240Hz specification does—and does not—promise
“240Hz” is a maximum mode under stated conditions, not a promise that every input and cable path will deliver it. Resolution, HDR, color depth, compression such as Display Stream Compression (DSC), graphics hardware, operating-system mode, and the selected input all affect the available combination.
VESA’s February 28, 2022 UHBR certification announcement uses uncompressed 4K at 240Hz with HDR as a capability example and defines DP40 and DP80 cable certification classes. That announcement demonstrates what a sufficiently capable DisplayPort link can carry; it does not mean every 240Hz monitor needs a DP40 or DP80 cable. The DisplayPort FAQ likewise notes that not every display needs the highest link bandwidth to reach its maximum resolution and refresh rate.
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Use those standards as comparison points rather than shopping rules. The monitor manual remains the source for the required input, resolution, and cable capability. A cable advertised with a larger number cannot compensate for a laptop port, graphics card, adapter, or monitor input that supports only a lower mode.
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Final diagnostic checklist
- The intended monitor is selected in Settings > System > Display.
- Advanced display shows 240Hz for the chosen resolution, without an incompatibility warning.
- The monitor OSD reports the expected input refresh rate.
- The cable is connected directly to the correct graphics output and monitor input.
- The exact monitor manual confirms the resolution, input, and refresh-rate combination.
- The graphics card or integrated graphics output supports that combination.
- Any adapter, dock, KVM, or hub has been bypassed during testing.
- USB-C equipment supports DisplayPort Alternate Mode when USB-C video is used.
- Windows 11 DRR has been tested off if a game alone appears capped.
- Game-level frame-rate limits have been checked separately from the monitor’s refresh rate.
If 240Hz remains unavailable after these checks, the missing detail is the exact monitor model, resolution, graphics hardware, operating-system version, and connection path. Those specifications are required to determine whether the limitation is a supported-mode boundary or a faulty component.
Frequently Asked Questions
Why does Windows show only 60Hz for my 240Hz monitor?
Windows may be using the wrong display, a resolution that does not support 240Hz, an input with a lower limit, or a graphics output, adapter, dock, or cable that cannot carry the required mode. Check Advanced display, then compare the exact resolution and input with the monitor manual.
Do I need DisplayPort for every 240Hz monitor?
No. There is no universal HDMI-versus-DisplayPort rule. Some models support 240Hz through HDMI, others require a particular DisplayPort version, and some offer different rates on each input. Follow the mode table for the exact monitor and graphics device.
Does a 240Hz monitor require a DP40 or DP80 cable?
Not automatically. VESA uses uncompressed 4K at 240Hz with HDR as a UHBR capability example, but its DisplayPort guidance notes that not every display needs the highest link bandwidth. Match the cable capability to the monitor manual and both ports.
Why is my USB-C monitor limited to 60Hz?
USB-C video requires DisplayPort Alternate Mode support on the computer, the specific USB-C port, the display, and the cable. Connect directly to the computer and bypass a hub or dock while testing; a charge-only cable or a video-limited dock can restrict the mode.
Windows says 240Hz, but my game still feels like 60Hz. What should I check?
Read the monitor’s OSD first. If it reports 240Hz, inspect the game for a 60 FPS cap, V-Sync behavior, or its own refresh-rate selector. On Windows 11, test with Dynamic Refresh Rate disabled when the game alone behaves as though it is using a lower rate.
What information is needed for model-specific troubleshooting?
Provide the exact monitor model, selected resolution, graphics card or integrated-graphics model, operating-system version, monitor input, computer output, and every device in the connection path. Those details determine whether 240Hz is a supported combination.
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Set 240Hz for the correct monitor in Windows Advanced display, then verify the monitor OSD. If the option is missing, compare the exact resolution/input pair with the model manual, connect directly to a capable graphics output, and test the cable, adapter, dock, or USB-C path. Finally, separate the monitor’s refresh rate from a game’s frame-rate cap and test Windows 11 DRR off when appropriate.
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