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To show your computer on a TV with HDMI, connect the computer’s video output to an HDMI input on the TV, select that input on the TV, then choose whether to mirror or extend the screen on your computer. If the computer has no HDMI port, a compatible USB-C or Thunderbolt-to-HDMI adapter may work; check its specifications before buying.
Check the ports and choose a cable or adapter
Look at the computer’s video-output ports and the TV’s inputs. If both have HDMI, connect them with an HDMI cable. If the computer has USB-C or Thunderbolt but no HDMI port, use an adapter or cable that supports video output from that exact computer. Not every USB-C port carries video, and adapters can limit available resolution or refresh rate.
Apple documents HDMI connections from a Mac using an HDMI cable or adapter, and advises checking adapter specifications. See Apple’s HDMI connection guidance. For an 8K Mac setup covered by Apple’s guidance, the recommended cable is Ultra High Speed HDMI rated at 48 Gbps; Apple says a direct connection provides the highest resolution and refresh rate for that use case. See Apple’s 8K display guidance.
Maximum resolution, refresh rate, HDR support, and other capabilities depend on the computer, TV, cable, and any adapter in the chain. Check the specifications for the exact models rather than assuming a particular mode from the connector type alone.
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Connect the computer and select the TV input
- Turn on the TV.
- Connect the HDMI cable to the computer and to an HDMI input on the TV. If you need an adapter, connect it between the computer and HDMI cable as its instructions specify.
- Use the TV remote’s input or source menu to select the HDMI port you used, such as HDMI 1 or HDMI 2.
- On a Mac, open Apple menu > System Settings > Displays to confirm the external display appears and adjust its settings. A properly powered and connected display should be detected automatically, according to Apple’s display setup guidance.
Choose mirroring or an extended desktop
Windows: choose a projection mode
Press Windows key+P to open the projection options. Microsoft lists these modes in its multiple-monitor guidance:
- Duplicate: Show the same image on the computer and TV. Choose this to present or watch the same content on both.
- Extend: Use the TV as extra desktop space. You can move windows between the computer display and TV.
- Second screen only: Show the desktop on the TV and turn off the computer’s display output.
- PC screen only: Use the computer display rather than the TV.
Mac: arrange displays in System Settings
Open Apple menu > System Settings > Displays to arrange the screens and change the available display settings. Whether a Mac can use multiple external displays, and which options appear, varies by Mac model and connected display. Apple’s display guidance explains how to manage connected displays.
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Send sound to the TV
If the picture appears on the TV but sound still plays through the Mac, open System Settings > Sound > Output and select the HDMI-connected TV or display. The name shown can vary by device. For protected video playback, Apple notes that the external display must be HDCP-compatible; this is relevant to protected content, not a general explanation for every picture or sound problem. See Apple’s HDMI guidance.
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Fix a blank, cropped, or low-quality picture
- Check the TV input. Make sure the TV is set to the exact HDMI port where the cable is connected.
- Check the connection. Reseat both ends of the cable and any adapter. If possible, try another HDMI input or a known-compatible cable.
- Confirm the computer sees the TV. On a Mac, open System Settings > Displays. On Windows, press Windows key+P and choose a projection mode.
- Try a supported display mode. Select a resolution and refresh rate supported by the computer, TV, and any adapter. Apple directs Mac users to display settings for resolution and refresh rate; the available choices vary by connected hardware.
- Check adapter limits. If the TV works at a lower resolution or refresh rate than expected, check the adapter’s supported modes as well as the computer and TV specifications.
- Adjust overscan if the image is cropped. If desktop edges extend beyond the TV screen, Apple describes this as an overscan or underscan issue; check the TV or projector’s picture settings. See Apple’s HDMI troubleshooting notes.
- Check HDCP only for protected playback. If ordinary desktop output works but protected video does not, verify that the external display supports HDCP.
HDMI or wireless projection?
This guide covers a direct wired HDMI connection. Windows also supports wireless projection to compatible Miracast displays; the setup is separate from connecting by HDMI. Microsoft describes that option in its wireless display guidance. No general speed or reliability comparison applies to every device and network, so choose based on the ports and capabilities you have.
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