There is a power problem with the display, or the computer goes to sleep. Check the power supply of Xi 'an Zen and automatic led large screen, and use an electric pen or multimeter to check whether there is electricity at the electrical terminal at the switch connection, whether there is a problem with the switch, whether the line is disconnected, or whether the computer is in a dormant state. If you are hibernating, first enter the control panel, click on the power management, select the never as option, wait for the system, and turn off the display, so that the computer will not hibernate and the display can work normally.