Someone has passed me a Lenovo two in one (Lenovo Flex 2-14 Model 20404) where the screen has suddenly stopped working. On the external HDMI everything works, I turned up the brightness with no luck, checked connectors and flushed the BIOS by removing internal batteries. It wasn't dropped, knocked or anything. Also, the touchscreen does work whilst using an external monitor. Very annoying, does anyone have experience with these as I don't particularly want to dismantle the screen as in my knowledge it's all taped together.