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Connect the laptop’s HDMI video output to an HDMI input on your monitor, TV, or projector. Then select that same HDMI port with the display’s Input or Source control. If the laptop has no HDMI output, USB-C video may work through an adapter—but only if that specific USB-C port supports video output.
Which HDMI input should you use?
For a direct HDMI connection, plug the cable into the laptop’s HDMI output and into an HDMI input on the display. The laptop sends the picture; the monitor or TV receives it. On the display, choose the HDMI input that holds the cable—often labeled HDMI 1, HDMI 2, or similar.
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There is no special HDMI input reserved for laptops. If the display has several HDMI ports, use any available one, then select its matching label as the source. The display’s manual can help identify its inputs and any port-specific settings.
How to connect a laptop to a monitor or TV with HDMI
- Check the ports. Look for an HDMI output on the laptop and an HDMI input on the display. If you are unsure what a port supports, check the specifications for the exact laptop and display models.
- Connect the cable. With compatible HDMI ports on both devices, plug an HDMI cable into each. Make sure it is seated securely at both ends.
- Select the display input. Use the monitor or TV’s Input or Source control and choose the HDMI port where the cable is connected.
- Choose how Windows uses the display. Press Windows key + P to open the projection options, then choose a mode: Duplicate mirrors the laptop screen, Extend adds workspace, Second screen only uses the external display, and PC screen only keeps the image on the laptop.
For Windows multiple-monitor guidance, see Microsoft’s instructions for using multiple monitors.
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Can you connect through USB-C?
Possibly. A USB-C connector’s shape does not confirm that it can send video. The particular laptop port must support video output through a compatible alternate mode, and the adapter or cable must support that mode as well. Microsoft explains that the feature must be supported by the computer or phone’s hardware and software, as well as the connected device or dongle, in its USB-C troubleshooting guidance.
Before buying a USB-C-to-HDMI adapter, check the laptop manufacturer’s specifications for the port and confirm the adapter supports the required video mode. Microsoft’s Surface external-display guidance applies to supported Surface models; it should not be treated as a specification for every laptop.
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Why does the TV or monitor say “No signal”?
Work through the connection from display to laptop, changing one thing at a time:
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- Reseat the cable at both ends. If possible, try a known-working HDMI cable.
- If you are using USB-C, verify that the exact laptop port supports video output and that the adapter or cable supports the required mode. For diagnosis, test a direct connection rather than a hub or dock where practical.
- In Windows, press Windows key + P and select Duplicate, Extend, or Second screen only so the external display is included.
- If the display offers an HDMI port-version setting, consult its manual and check whether the setting is appropriate for the connection.
- Check the laptop and display specifications for supported resolutions, refresh rates, and connection combinations. Those capabilities vary by model, so a cable connection alone does not establish which modes the devices support.
Microsoft’s Surface external-display troubleshooting advice also recommends checking the selected input, cables, and available port-version settings; apply Surface-specific instructions only to supported Surface models.
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Choosing between direct HDMI and a USB-C adapter
| Connection | What must be supported | When to use it |
|---|---|---|
| HDMI cable | The laptop must have HDMI video output, and the display must have an HDMI input. | Use this direct connection when both devices have compatible HDMI ports. |
| USB-C-to-HDMI adapter or cable | The particular laptop USB-C port must support video output; the adapter or cable must support a compatible mode; and the display must accept the signal. | Use it when the laptop lacks HDMI output and its USB-C port supports video. |
Neither connection guarantees a particular resolution or refresh rate. Check the specifications of both devices and the adapter or cable for the mode you intend to use.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What HDMI does
HDMI carries digital audio and video between compatible devices. Microsoft describes the HDMI port on supported Surface devices as an interface for transmitting uncompressed video data and compressed or uncompressed digital audio data in its Surface display connection guidance. That description explains the interface; the available ports and capabilities still depend on the laptop model.
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