If your PC is connected to a monitor or TV by HDMI but the screen is blank or says “No signal,” check the monitor’s input and both cable connections first. Then test another cable or display, confirm you are using an active video port, and check Windows’ display settings. These steps help narrow down the cause without assuming the cable—or any single component—is faulty.
1. Check the monitor input and HDMI connection
Make sure the monitor is powered on and set to the HDMI input connected to the PC. If it has more than one HDMI port, select the matching input in its on-screen menu. MSI’s troubleshooting guidance likewise starts with selecting the correct input source: MSI monitor no-display troubleshooting.
- Unplug and firmly reconnect the HDMI cable at both the PC and monitor.
- Temporarily remove any dock, adapter, dongle, or other accessory between the PC and display.
- Try another HDMI cable that you know works. If that fixes the picture, the original cable may be faulty; if not, continue checking rather than replacing parts by guesswork.
Microsoft recommends checking connections, removing accessories, and trying another cable when troubleshooting an external display: Microsoft’s external-monitor troubleshooting steps.
2. Cross-test the PC and display
When possible, connect the monitor to another computer, or connect the PC to another monitor or TV. These tests help identify which side to investigate next; they do not by themselves prove that a particular component has failed.
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- If the monitor also fails with another source, investigate the monitor or its input.
- If the PC fails with another display, investigate the PC’s output, Windows configuration, or graphics hardware.
Intel also recommends testing with another display and cable: Intel graphics display troubleshooting.
3. Use the correct video port on the PC
A desktop may have HDMI ports both on the motherboard and on a separate graphics card. Connect the display to an active graphics output. On some systems without integrated graphics, the motherboard’s video output will not produce a picture; use the dedicated graphics card’s output instead. The correct port depends on the PC’s hardware, so check its documentation if you are unsure. See MSI’s desktop display guidance.
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4. Choose a Windows display mode and detect the screen
Windows may be sending the picture to a different display mode, or it may not have detected the connected screen.
- Press Windows key + P and choose the mode you want: Duplicate mirrors the PC screen, Extend creates a separate desktop, and Second screen only uses the external display. Choose PC screen only to return to the computer’s built-in screen.
- If the external screen is not listed, open Settings > System > Display. Under Multiple displays, select Detect.
Menu wording can vary slightly by Windows version. Microsoft documents these display options for Windows 10 and 11: Microsoft: use multiple monitors in Windows. Microsoft says Windows 10 support ended on October 14, 2025; Windows 10 PCs still work, but the support described on that page no longer includes free updates, technical assistance, or security fixes.
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5. Bypass docks and check multi-display limits
If you are using a dock, adapter, or dongle, connect the HDMI cable directly to the PC during diagnosis, if possible. An accessory can introduce a compatibility or connection problem. For a multi-monitor setup, also check whether the PC’s graphics adapter supports the number of displays you want. A basic HDMI splitter duplicates one signal; it does not create independent extended desktops. See Microsoft’s accessory troubleshooting advice and its multiple-monitor guidance.
6. Check the graphics driver if the problem followed an update
Driver changes are worth investigating when the HDMI display stopped working after a graphics-driver update—not as the first response to an uncertain input or loose cable. Microsoft documents rolling back a display driver in Device Manager when a recent update caused a problem; if rollback is unavailable or does not help, its guidance also covers reinstalling the driver: Microsoft’s external-monitor troubleshooting steps.
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For Intel graphics in a branded computer, check the computer maker’s driver first. Manufacturers may customize drivers for their systems, so a generic driver is not always the best match. Intel’s guidance, last reviewed September 4, 2024, explains this consideration: Intel graphics display troubleshooting. Driver menus and procedures can vary by Windows build and manufacturer.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.7. Decide what to investigate next
- If the monitor does not work with another source, contact its manufacturer or consult its support guidance.
- If the PC fails with multiple known-good displays and cables, identify its graphics adapter and contact the PC or graphics-card manufacturer.
- If another cable, PC port, or Windows display mode restores the picture, use that result to focus further troubleshooting on the component or setting that changed.
The appropriate next step depends on the specific PC, display, and connection path; a blank HDMI screen alone does not identify a failed part.
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