Problems with my monitor
From ViewSonic Documentation
Why doesn’t my monitor have any power?
The power cord may not be properly and securely connected to both the monitor and power outlet. Additionally, the monitor may not have been turned on via the power button. As a final suggestion, you may want to test if the power outlet is supplying power by plugging in another electrical device.
The power is on, so why isn’t my monitor displaying an image?
The video cable (HDMI, DisplayPort, USB Type C, VGA, etc.) connecting the monitor to the computer (or other video output device) may not be connected properly. Please make sure the cable is properly and securely connected at both ends. Also, ensure that the correct video input source is selected on the monitor. (e.g., if you are connecting via and HDMI cable, select HDMI as your input source.)