DIAGNOSIS Your laptop's USB-C port likely only supports power and data, not DisplayPort Alt Mode (which carries the video signal). It's a port capability issue, not a monitor fault.
FIX You'll need to use the HDMI port on the monitor. Connect your laptop's HDMI output to the monitor's HDMI input using a standard HDMI cable. Then, you must also plug a USB-C cable from the monitor's second USB-C port (the one labeled for power, usually with a little battery icon) into a power source—either a wall charger or a separate USB-A port on your laptop. It needs both connections.
IF THAT DIDN'T WORK On some Windows laptops, you need to enable the external display manually. Press the Windows key + P and select "Extend" or "Duplicate." Also, check your graphics driver settings to ensure the HDMI output isn't disabled.
HEADS UP Many thinner laptops, especially older business models, have USB-C ports that don't support video. Always check your laptop's specs for "DisplayPort over USB-C" or "Video Alt Mode" support before blaming the monitor.