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If your external monitor shows no signal when you connect it with the Thunderbolt 4 Pro Cable (ST-YTB100K), the cause is usually the display, the resolution setting, or the connection at one end. Work through the steps below to get a picture back.

Steps to fix no display with the Thunderbolt 4 Pro Cable

1. Reseat both ends. Disconnect the Thunderbolt 4 Pro Cable and firmly reconnect it at both your computer and the monitor so each end is fully seated.
2. Confirm the monitor accepts video. The Thunderbolt 4 Pro Cable carries video only when the monitor supports video on its Thunderbolt or USB-C port. Connect it to a Thunderbolt-compatible or USB-C display that is built to receive video.
3. Confirm your computer's port carries video. Make sure the port you are using is a Thunderbolt or USB-C port that supports video output, since not every port does.
4. Detect the display and lower the resolution. On a Mac, open System Settings, then Displays, and click Detect Displays (hold the Option key to reveal the button). Set the resolution to 4K at 60Hz to test for a reliable signal. The Thunderbolt 4 Pro Cable supports up to 8K at 60Hz on a single display when your computer and monitor also support that resolution.
5. Inspect and clean the connectors. Check both connector ends and both ports for dust or debris, and clear anything you find.
6. Swap parts to isolate the problem. Test with another Thunderbolt-compatible display or a different Thunderbolt port to see whether the issue is the monitor, the port, or the cable.