1. Check the HDMI ports: first make sure the HDMI cable is securely connected to both your laptop and the HDMI device.
2. Check the video output settings: some laptops have dedicated keys for enabling or disabling video output. See the manufacturer guide for more information.
3. Check your laptop display settings: if you have multiple display options, be sure the correct option is selected.
4. Disable and re-enable your laptop: try turning off your laptop, disconnecting the HDMI device, and then turning your laptop back on. Reconnect the HDMI device and see if it works.
5. Update your laptop’s graphics driver: check the display or graphics driver page of your laptop manufacturer’s web site for driver updates.
6. Contact technical support: if the problem persists, contact technical support for your laptop manufacturer or the device manufacturer for assistance.