When the screen shows no signal and the indicator light is red, it means the monitor is powered, but no AV signal. Please check if you're using the USB Type-C 3.1 cable, and the cable is connected to the multi-function USB-C port on the monitor and computer. The cable and interface with USB-C look the same, but the function can be different. Some are only for charging, some for data. A multi-function USB-C port supports huge charging power up to 100W, data transfer up to 10 Gbps, and media display at resolutions up to 4K.