Devices use HDMI, DisplayPort, VGA, and DVI-D ports with compatible cables and adapters. In one common setup, a DisplayPort connector on a PC or laptop connects to an HDMI monitor using an HDMI cable or adapter. The opposite setup sends HDMI output to a DisplayPort input. These directions are not interchangeable, so a cable that fits can still produce no signal.
First, Identify the Signal Direction
Read adapter direction from the source device to the display—not by connector shape.
| Source/output | Display/input | Correct adapter | First check |
|---|---|---|---|
| DisplayPort source | HDMI display | DP-to-HDMI; passive may work with DP++, otherwise use active conversion. | Passive: confirm DP++; both types: confirm the target mode. |
| HDMI source | DisplayPort display | Active HDMI-to-DisplayPort converter; DP-to-HDMI cables do not work in reverse. | Connect supplied power and confirm the supported output. |
Why Is HDMI to DisplayPort or DisplayPort to HDMI Not Working?
Well, there might be a couple of underlying connection issues from hardware and software. The first question is which direction the signal must travel. Here are some common reasons why an HDMI-to-DisplayPort or DisplayPort-to-HDMI connection may not work:
Compatibility Issues: Not all DisplayPort-to-HDMI cables or HDMI-to-DisplayPort converters are created equal. The adapter direction, conversion type, power requirement, supported resolution, and refresh rate all have to match the setup.
Faulty Cable or Adapter: Sometimes, the issue is a simple faulty cable or adapter that you are using. These components can wear out or get damaged over time.
Incorrect Settings: Your device settings might not be configured correctly. This could include the resolution, refresh rate, or even the source settings on your monitor or TV.
Driver Issues: Outdated or corrupted graphics drivers can cause connectivity problems, but check direction, power, cables, and ports first.
Hardware Problems: Sometimes, the problem might lie with the hardware itself, such as a damaged output on your computer or input on your monitor, which can inhibit signal transmission.
How to Fix HDMI to DisplayPort or DisplayPort to HDMI Not Working
Now that we know the potential reasons, let’s troubleshoot in order: direction and power first, software later.
Troubleshooting Order
- Trace the signal from source output to display input.
- Read the direction label on the cable or converter.
- Connect power if the active converter includes a power lead.
- Bypass other devices, then test settings and drivers.
1. Check the Cable and Adapter
Inspect for damage: Look for any visible signs of wear and tear on the cable and adapter. A bent connector, cut cable, or loose housing can cause no signal or intermittent dropouts. If they look damaged, it might be time to replace them.
Try a different cable or adapter: If you have another cable or adapter rated for the same signal direction and target display mode, try using that to see if the problem persists.
2. Check the Connections
Secure the connections: Ensure that the cable is securely connected to the source device's output and the monitor or TV's selected input. Loose connections can often cause issues.
Try different ports: If the source device has multiple video outputs or the display has multiple inputs, try another compatible port and select that input on the display.
For an isolation test, remove docks, KVM switches, splitters, receivers, and extensions. Connect one source, one correctly directed converter, and one display; then add other components back individually.
3. Update Drivers
Graphics drivers: Make sure your graphics drivers are up-to-date. You can find the latest drivers on the website of your graphics card manufacturer or by updating your computer's operating system.
Display drivers: Update your monitor or TV drivers if available. Also check whether the manufacturer provides model-specific firmware or control software and follow its update instructions.
4. Adjust Screen and Resolution Settings
Resolution and refresh rate: Ensure that the resolution and refresh rate settings on your computer are supported by the entire chain: source, converter, cable, and monitor or TV. Start with a common mode such as 1920 × 1080 at 60 Hz, then increase one setting at a time.
If 1080p works but 4K or high refresh does not, the requested mode is unsupported or failing to negotiate. Check the source, converter, cable, display, and settings.
Source settings: Make sure that your monitor or TV is set to the correct input source.
5. Restart Devices
Power cycle: Sometimes, simply restarting your devices can fix connectivity issues. Turn off your computer and monitor/TV, unplug them for a few seconds, and then plug them back in and turn them on.
6. Use the Correct Active Converter When Required
Active vs. Passive Adapters: HDMI output to DisplayPort input requires active protocol conversion; connect the converter's USB or DC power lead when one is supplied. For DisplayPort output to HDMI input, a passive adapter may work when the source supports DP++, while an active adapter can be used with a standard DisplayPort source. Active does not automatically mean 4K at 60 Hz, so confirm the converter's direction and supported mode.
Frequently Asked Questions
Can a DisplayPort-to-HDMI cable work in reverse?
No. DP-to-HDMI cables are directional; HDMI output to DisplayPort input needs a purpose-built converter.
Do I need an active or passive adapter?
Use active conversion for HDMI source to DisplayPort display. For DP source to HDMI display, passive may work with DP++; otherwise use active.
Why does 1080p work but 4K or 60 Hz does not?
The mode may be unsupported or may not be negotiating correctly. Check the entire source-to-display chain.
Why is there video but no audio?
Confirm the converter carries audio in that direction, select the display audio output, and check for monitor speakers or audio out.
Conclusion
Dealing with an HDMI-to-DisplayPort or DisplayPort-to-HDMI connection that does not work can be frustrating, but these troubleshooting tips should help. Start with signal direction, then check power, cables, ports, settings, and drivers. Test one variable at a time, and seek professional help if the issue persists.