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Fix a Chromebook that has HDMI that will not work

We'll rule out cable, display input, and detection, then isolate the cause—loose cable, wrong input, or bad port—or tell you when to call support.

Troubleshooting · Home maintenance
5–15 min
What you'll need
  • HDMI cable or USB-C to HDMI adapter
  • External display (TV or monitor)
Step 1 of 5

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Steps

Goal: Rule out cable, input, and detection so HDMI works.

  • Confirm the HDMI cable is firmly connected at both ends.
  • Good: Connected. Proceed to Check connections.
  • Bad: Reseat the cable; set the display to HDMI input.

Check connections

Goal: Ensure cable and display input are correct.

  • Reseat the cable. Set the external display to the correct HDMI input.
  • Good: Cable and input correct. Proceed to Detect display.
  • Bad: Try a different cable or display.

Detect display

Goal: Have the Chromebook detect the external display.

  • Press the display key or open Settings > Device > Displays > Detect.
  • Good: Display is detected. Adjust resolution if needed.
  • Bad: Try a different cable, adapter, or display.

When to get help

Contact support if:

  • The cable and display work with another device.
  • The Chromebook still does not output video.

Verification

  • The external display shows the Chromebook screen (mirror or extend).
  • Video and audio (if supported) work.
  • No “No signal” on the display.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Connections Reseat cable; set display to HDMI input.
  2. Detect Display key or Settings > Displays > Detect.
  3. Different cable Try another HDMI cable or adapter.
  4. Call support Cable and display work elsewhere, Chromebook port may be faulty.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Chromebook model and port type (HDMI or USB-C)
  • Whether cable works with another device
  • Steps already tried

Is the HDMI cable firmly connected at both ends?

Loose connection is common.

Reseat at Chromebook and display. Set display to HDMI input. Yes: press display key or Detect. No: connect firmly, set input.

Yes No

You can change your answer later.

Did you try Detect or the display key?

Chromebook must detect the display.

Settings > Device > Displays > Detect. Or press display key. Detected: check resolution. Not detected: try different cable or display.

Yes No

You can change your answer later.

Connect and set input

Plug HDMI at both ends. Set display to HDMI 1 or 2. Press display key on Chromebook.

Done

Try different cable

Use another HDMI cable. If USB-C adapter, try different adapter. Try different display.

Done

HDMI working

Display is detected. Use Settings to mirror or extend.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would Chromebook HDMI not work?
Loose cable, display on wrong input, display not detected, or faulty cable/port. Check connections and display input first.
Can I fix HDMI myself?
Yes. Reseat the cable. Set the display to HDMI input. Use the display key or Settings to detect. Try a different cable.
When should I call support for HDMI?
If the cable and display work with another device, and the Chromebook still does not output. The port may be faulty.

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