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HP 250 G4 working and there is no display. Please HELP… LCD and connector everything is fine.

Hi, Have you tried repeatedly pressing the screen image display key (5th key from left, top row - rectangle symbol with line either side) toggling between laptop, external and both to see if the laptop display comes on? Try connecting an external monitor to the laptop’s HDMI port and check if you get a display on it. Even a TV can be used as an external monitor as long as it has HDMI inputs and you have a HDMI cable with the appropriate connectors to connect the two devices together.