After that plug the AC adapter ans try starting the laptop again. Try installing the memory module into the other slot (if it’s available).If you have two memory modules installed, try removing them one by one and start the laptop just with one memory module installed.The switch turns off the backlight when you close the LCD display to save the laptop battery power. Usually it is a small plastic pin located close to the LCD hinges.Try to tap on the switch a few times to turn on the backlight.If the external video is fine, you have a problem with the LCD screen or the LCD video cable.You can try to fix the problem by reseating the video cable on the back of the LCD and on the system board.
It is also possible that after tapping on the LCD lid close switch the backlight works fine, you see a normal video on the screen for some time and then the backlight turns itself off again. Try to reseat cables on both end of the FL inverter to make a better contact between the cables and the FL inverter board.
Hence you’ll find several roms for the same card but for different memory chips.
Remember it’s very difficult to get hold of the RX 570’s since theyre out of stock, hence some of you are wondering why the heck would you mix cards? Since I’m not familiar with overclocking AMD Cards can’t get MSI Afterburner to show any stats on the RX 570, I decided to update the bios using a rom already created by the team (or guy) at https://anorak.tech/ . I believe Anorak creates / upload custom roms based on your particular card, the most important point Anorak mentions in their posts is that different memory chips have different timings (makes sense).
I would also try reseating cables if there is no video on the LCD screen at all.
Try to connect the LCD screen to an external monitor.