Check that your monitor is powered on. Ensure your monitor and PC are connected. If you're using a graphics card, check you're using the correct port. Make sure you're on the right monitor input
2. Use a Hardware KVM Switch. Another option is to use a hardware device called a KVM switch. KVM stands for “Keyboard, Video, and Mouse”. A KVM switch is a device that can control multiple There's also the option of investing in a monitor that natively supports DP 1.4 MST up (through DisplayPort or USB-C) and DP 1.2 or 1.4 down to start a daisy chain. Please follow the steps below to ensure the USB-C connector is not damaged. Connect the USB-C cable in a straight line into the USB-C port of your external device; Once again, when unplugging the cable, grab it at the blue circle area and pull out the cable in a straight line. Note: Do not bend the USB-C cable connector up, down, left, or rightThe USB-C port on that model laptop is nothing more than a USB 3.1 port for data only. It is not wired for HDMI or Displayport. The only way you could add a 2nd external monitor to a USB port is with a special converter/adapter.
Solution. #2. Nope. Thunderbolt is what allows the video display over USB C. You could get a USB C display adapter to add a third display. These actually have a basic 2D GPU in the adapter itself. Don't expect any kind of gaming/3D performance though. They are strictly for 2D OS functionality. Krotow and LetterC67..