Using this Ross Vision QMD 1 M/E Video Switcher is straightforward. First, connect the power supply that comes with the product to make sure it has the right power. For the screen output, if the DVI doesn't work, you can use the VGA output. When operating the panel, if the touch - screen doesn't function as expected, you can use a mouse instead. As for maintenance, keep the switcher in a clean and dry place. Periodically check the connections to ensure they are secure. Also, be gentle with the panel module screens to avoid further damage to the dim pixels.