The “No HDMI Signal” message means the monitor is not receiving an active video signal through the HDMI connection. The monitor itself may still be working correctly. The problem can be somewhere between the display, HDMI cable, graphics output, or connected device.
Before making major changes, check the simple things first. A loose cable or incorrect input selection can look like a serious hardware failure even when everything is working properly.
If the monitor works with another device, the monitor is probably not the problem. Similarly, if your computer works with another display, you can narrow the issue down to the original monitor, HDMI cable, or HDMI port.
Let’s explore in detail!
Possible Causes
There are several reasons why a monitor may display “No HDMI Signal From Device.” Understanding the possible cause can make troubleshooting much easier.
A loose HDMI cable is one of the most common causes. If the connector is not seated correctly in the HDMI port, the monitor may fail to detect the connected device.
The wrong input source can also cause the problem. For example, if your monitor is set to DisplayPort while your computer is connected through HDMI, the monitor will not display the computer’s screen.
A faulty HDMI cable or HDMI port can prevent the video signal from reaching the monitor. Physical damage, worn connectors, or internal cable failure can all cause connection problems.
The issue can also occur because of a graphics driver problem, incorrect resolution, an unsupported refresh rate, or a temporary Windows display error.
In some cases, the computer may be running, but the graphics card is not outputting a video signal. This can happen because of a loose graphics card, a power issue, hardware failure, or connecting the HDMI cable to the wrong port.
Monitor Says No HDMI Signal From Device
To fix the “No HDMI Signal From Device” error:
- Check that the HDMI cable is firmly connected to both devices.
- Select the correct HDMI input source on the monitor.
- Disconnect and reconnect the HDMI cable after turning off both devices.
- Try another HDMI cable or HDMI port.
- Make sure the cable is connected to the correct graphics output port.
- Restart the computer and monitor.
- Check Windows display settings and graphics drivers.
- Test the monitor with another computer or device.
- If possible, test the computer with another monitor or TV.
- Check the graphics card and other hardware if the problem continues.
Step 1: Check the HDMI Cable Connection
Start by checking the physical HDMI connection. Turn off the monitor and the connected device, such as your Windows PC. Locate the HDMI cable and make sure one end is firmly connected to the computer and the other end is firmly connected to the monitor.
A partially connected HDMI cable may still look like it is plugged in, so gently push both connectors into their ports. Do not force them, because HDMI ports can be damaged by excessive pressure.
If you are using a desktop computer with a dedicated graphics card, pay close attention to where the cable is connected. The HDMI port on the graphics card is generally the correct choice when the computer uses a dedicated GPU.
Step 2: Select the Correct HDMI Input
Your monitor may have multiple input options, such as HDMI 1, HDMI 2, DisplayPort, and VGA. If the monitor is set to the wrong input, it will not display the connected device.
Use the physical buttons or joystick on the monitor to open its on-screen menu. Look for an option such as Input, Source, Input Source, or Signal Source.
Then select the HDMI port where your computer is connected.
For example, if your cable is connected to HDMI 1, select HDMI 1 from the monitor’s input menu. If you have two HDMI ports, try the other one if the first does not work.
Step 3: Power Cycle the Monitor and Computer
A complete restart can resolve a temporary HDMI detection problem. Shut down your computer completely and turn off the monitor.
Next, unplug the monitor’s power cable and disconnect the HDMI cable. Wait for about 30 seconds before reconnecting everything.
Connect the HDMI cable securely, plug the monitor back into power, and turn it on first. Then start your computer.
This process can force the computer and monitor to establish a fresh HDMI connection instead of relying on a failed connection from the previous session.
Step 4: Try a Different HDMI Cable
If the connection still does not work, the HDMI cable itself could be defective. HDMI cables can develop problems from repeated bending, pulling, or physical damage.
Try another HDMI cable that you know works properly. Connect it between the computer and monitor and check whether the display appears.
If the second cable works, you have identified the original cable as the likely cause.
You do not necessarily need an expensive HDMI cable for ordinary computer use. The important factor is using a cable that supports the resolution and refresh rate you are trying to run.
Step 5: Try Another HDMI Port
If your monitor has more than one HDMI port, try connecting the cable to another port.
For example, if you are currently using HDMI 1, switch to HDMI 2 and then change the monitor’s input source accordingly.
You can also try another HDMI output on your computer if one is available.
If one HDMI port works and another does not, the problem may be limited to a particular HDMI port rather than the entire monitor or computer.
Step 6: Check the Graphics Output Port
This step is especially important for desktop computers.
If your PC has a dedicated NVIDIA, AMD, or Intel graphics card, check where the HDMI cable is connected. A dedicated graphics card usually has its own video outputs located lower down on the back of the computer.
If your monitor cable is connected to the motherboard’s HDMI port while your system is configured to use a dedicated graphics card, you may receive no display.
Move the HDMI cable to the appropriate graphics card output and restart the computer.
If you are unsure which port belongs to the graphics card, look at the arrangement of the ports on the back of the PC and check your computer or graphics card documentation.
Step 7: Check Windows Display Settings
If Windows starts but the monitor does not display correctly, the issue could involve the selected display mode.
If you can access another working screen, press Windows + P to open the projection options. Select PC screen only or Duplicate, depending on your setup.
You can also open the display settings through:
Start > Settings > System > Display
Check whether Windows detects the monitor. If another display is connected, select Identify or Detect where available.
Incorrect resolution or refresh rate settings can sometimes prevent a monitor from displaying an image properly, particularly after changing monitors or graphics hardware.
Step 8: Update or Reinstall the Graphics Driver
A corrupted or outdated graphics driver can cause display detection problems.
Open Start Menu > Device Manager > Display adapters
Expand Display adapters and locate your graphics hardware. Right-click it and select Update driver.
If the issue started immediately after a graphics driver update, you may also want to check whether the Roll Back Driver option is available.
After changing the driver, restart the computer and check whether the HDMI signal returns.
Step 9: Test the Monitor With Another Device
If you still see “No HDMI Signal From Device,” connect the monitor to another device.
You could test it with another computer, laptop, streaming device, or compatible game console.
If the monitor displays the second device correctly, the monitor and its HDMI input are probably working. The original computer is then the more likely source of the problem.
If the monitor shows no signal with multiple devices and different HDMI cables, the monitor’s HDMI input or internal hardware may require further attention.
Step 10: Test the Computer With Another Display
You can perform the opposite test by connecting your computer to another monitor or a compatible TV.
If the computer produces a picture on the second display, your original monitor, HDMI cable, or monitor input is likely responsible.
If the computer produces no picture on either display, the problem may involve the graphics card, graphics output, motherboard, power supply, or another hardware component.
At this point, hardware troubleshooting becomes more important than changing Windows settings.
Step 11: Check the Graphics Card and Hardware
If you are comfortable working inside a desktop PC, shut down the computer, unplug it from power, and inspect the graphics card.
Check whether the graphics card appears properly seated in its PCIe slot and whether its required power connectors are securely attached.
Do not open a laptop unless you are familiar with laptop hardware repair. For a laptop, external display problems may require manufacturer-specific troubleshooting.
If the computer has recently been moved, upgraded, or cleaned, a loose hardware connection could be responsible for the missing video signal.
Step 12: Reset the Display Connection
Windows also provides a useful keyboard shortcut for restarting the graphics driver.
Press Windows + Ctrl + Shift + B.
You may hear a short beep or see the screen briefly flicker. This shortcut tells Windows to restart the graphics driver without requiring a complete system restart.
Afterward, wait a few seconds and check whether the monitor begins receiving the HDMI signal.
FAQs
Why does my monitor say no HDMI signal when my PC is on?
Your PC can be powered on without sending a usable video signal to the monitor. Check the HDMI cable, input source, graphics output port, graphics card, and display settings.
Why does my monitor say no HDMI signal after I restart my computer?
A temporary display detection problem, graphics driver issue, or incorrect input selection can cause this. Try turning off the monitor, disconnecting the HDMI cable, reconnecting it, and restarting the computer.
How do I know whether my HDMI cable is bad?
The easiest test is to use another HDMI cable that you know works. If the replacement cable immediately restores the picture, the original cable is likely defective.
Why does my monitor say no HDMI signal but my computer works?
Your computer may be operating normally while the video output connection has failed. Test another HDMI port, cable, or display to determine which component is responsible.
Should HDMI connect to the motherboard or graphics card?
If your desktop has a dedicated graphics card, the monitor should generally be connected to the graphics card’s video output. Connecting to the motherboard can result in no display depending on your system configuration.
Can a graphics driver cause an HDMI no-signal problem?
Yes. A corrupted, incompatible, or problematic graphics driver can interfere with display detection and video output. Updating or rolling back the driver can sometimes resolve the issue.
What if nothing fixes the HDMI signal?
If multiple HDMI cables, ports, and displays have been tested and the computer still produces no video output, the issue may involve the graphics card or other hardware. Professional hardware diagnosis may be appropriate at that point.
Final Words
The “No HDMI Signal From Device” message does not automatically mean your monitor is broken. In many situations, the cause is a loose cable, incorrect input source, faulty HDMI cable, wrong graphics output, or temporary Windows display problem.
Start with the simplest solutions and work your way through the troubleshooting process. Check the HDMI connection, select the correct input, try another cable and port, and make sure the cable is connected to the correct graphics output.
If those checks do not work, test the monitor and computer with other devices to isolate the faulty component.