Thank you so much to support.
"Hi, Try the below steps and that should help you. >Remove any external monitor(s) or undock (when applicable). >Save any data, close any open program(s). >Plug in the AC adapter into the computer. >Download the and install the latest BIOS from the link https://dell.to/2DzT2ft >Download the and install the latest Intel HD 620/640/615 Graphics driver from the link https://dell.to/34O8pwU >Download the and install the latest Firmware update utility for enabling/disabling DBC (Dynamic Backlight Control) feature utility fro"