If your USB C-C cable isn't streaming video, you can try the following troubleshooting steps:

1. Make sure your device supports video transfer capabilities.
2. Check that your device has video output enabled, for example by looking at the display options in settings.
3. Try using a different USB C-C cable to connect.
4. Check if your USB C port is working properly, you can try connecting your device with another device to test.
5. Make sure your device and monitor are updated to the latest driver or firmware version.
6. If the problem persists, you can try connecting your device to a different monitor or TV to determine if the problem is related to your device.
7. Please try to reverse the USB C-C port re-insertion test to see if it is normal.
8. Please try flipping the USB C-C port and plugging it back in to see if it's normal.

If you don’t know what kind of USB C-C cable can support video output and connect a USC C monitor, you can refer to: USB C 3.1 Gen 2 Cable- 10Gbps Data/4K@60hz Video/100W PD Fast Charging