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Fix a Chromebook that has display that will not mirror

We'll rule out cable, input, and display mode, then isolate the cause—loose cable, wrong input, or extend mode—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 7

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Steps

Goal: Confirm the symptom, rule out cable and input, then select mirror mode.

  • Confirm the HDMI or USB-C 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: Confirm 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 Select mirror mode.
  • Bad: Try a different cable or display.

Select mirror mode

Goal: Have the Chromebook detect the display and switch to mirror mode.

  • Open Settings > Device > Displays. Click “Detect” if the external display is not listed.
  • Select the external display. Turn on “Mirror built-in display” or use the display key to cycle to mirror.
  • Good: Same image on both screens. Mirror mode is active.
  • Bad: Display not detected—try a different cable. Display detected but no mirror—try the display key or restart with the cable connected.

Detect and restart

Goal: Rule out detection issues.

  • Restart the Chromebook with the cable connected. Some Chromebooks detect displays better at boot.
  • After restart, open Settings > Device > Displays. Confirm the external display appears. Select mirror.
  • Good: Display detected and mirror works.
  • Bad: Try a different cable or adapter. If the cable and display work with another device, call support.

When to get help

Contact support if:

  • The cable and display work with another device.
  • The Chromebook still will not mirror after checking connections and display mode.

Verification

  • The external display shows the same content as the Chromebook screen.
  • Mirror mode is active in Settings > Device > Displays.
  • No “No signal” on the external 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 Settings > Displays > Detect; confirm external display appears.
  3. Mirror mode Select "Mirror built-in display" or use display key.
  4. Different cable Try another HDMI cable or adapter.
  5. 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 cable firmly connected at both ends?

Loose connection is common.

Reseat at Chromebook and display. Set display to HDMI input. Yes: open Settings > Displays. No: connect firmly, set input.

Yes No

You can change your answer later.

Is the external display detected?

Chromebook must detect the display before mirror works.

Settings > Device > Displays. Click "Detect" if the external display is not listed. Detected: select it and choose Mirror. Not detected: try different cable or display.

Yes No

You can change your answer later.

Is mirror mode selected?

Chromebook may be in extend mode instead of mirror.

Settings > Device > Displays. Select the external display. Turn on "Mirror built-in display" or use the display key to cycle to mirror. Mirror on: same image on both screens. Still extend: try display key or restart.

Yes No

You can change your answer later.

Connect and set input

Plug cable at both ends. Set display to HDMI 1 or 2. Open Settings > Device > Displays > Detect.

Done

Try different cable

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

Done

Restart with display connected

Restart the Chromebook with the cable connected. Check Settings > Displays for mirror after boot. If still no mirror, try different cable or call support.

Done

Mirror working

Same image on both screens. Mirror mode is active.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would Chromebook display mirror not work?
Loose cable, display on wrong input, display not detected, or Chromebook stuck in extend mode. Check connections and Settings > Device > Displays.
Can I fix display mirror myself?
Yes. Reseat the cable. Set the display to HDMI input. Use Settings > Displays or the display key to select Mirror. Try a different cable if needed.
When should I call support for display mirror?
If the cable and display work with another device, and the Chromebook still will not mirror. The port may be faulty.

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