If a monitor shows no picture through the Type-C Dual Multimedia Adapter, the most common reason is that only one of the adapter's two USB-C connectors is plugged into your laptop. The Type-C Dual Multimedia Adapter connects through dual USB-C connectors, and both USB-C connections are required for the adapter to function fully. Its two HDMI ports each support up to 4K at 60Hz and need a direct HDMI to HDMI connection, and the adapter is plug and play with no drivers required. Work through the steps below in order.

Steps to fix the display on the Type-C Dual Multimedia Adapter

1. Plug both USB-C connectors on the Type-C Dual Multimedia Adapter into the two USB-C ports on your laptop. Both connections are required for the adapter to function fully.
2. Check the LED indicator, which illuminates when the Type-C Dual Multimedia Adapter is connected to your laptop.
3. Connect your monitor to one of the two HDMI ports with a direct HDMI to HDMI connection. Both HDMI ports support up to 4K at 60Hz.
4. Switch your monitor to the correct HDMI input source.
5. Keep the resolution at or below 4K at 60Hz on each display.
6. Do not use the USB-C charging port for video. That port handles pass-through charging up to 60W and does not support data transfer or video output.
7. Try a different HDMI cable and a different monitor to rule out a cable or display fault.
8. On a Mac, open System Settings, go to Displays, then hold the Option key and click Detect Displays, and check whether the arrangement is set to Extend or Mirror. On Windows, open Settings, then System, then Display.
9. Disconnect the Type-C Dual Multimedia Adapter from your laptop, then reconnect both USB-C connectors.
10. Install any pending operating system updates, then reconnect the Type-C Dual Multimedia Adapter.