If your monitor shows no signal with the USB-C to HDMI 2.1 8K Adapter, try these steps:

• Make sure the adapter’s USB-C connector is fully seated in your computer’s port.
• Try a different HDMI cable (for 8K/high refresh rates, use a cable rated for it).
• Go to System Settings > Displays and click Detect Displays (hold the Option key on Mac).
• Test the monitor with a direct connection to confirm the monitor works.
• Confirm your computer supports video output through its USB-C port — not all USB-C ports carry video.

If the problem continues after these steps, submit a support request.