This managed to fix the error and confirm that it may be faulty backlight/inverter cabling that caused it. I lightly tapped around the hinge points of the screen to try and seat any loose cables back into position. Reset display adapter to Microsoft basic driver.Īny help would be much appreciated as this is the laptop I use for work and thus it is quite an urgent matter.Īfter a few hours I read about the possibility of loose cabling being the cause. If it is not working, then update the BIOS. Now, press the fn key + spacebar or Esc key in the BIOS window to check the keyboard’s backlight. You any also press Enter ket at the stat up to open the BIOS on your system. Now I sit with the problem of no back-light and the external monitor is not recognized when I plug it in. Restart the Laptop and press the F1 key when you see the Lenovo logo at startup. I can barely make out the screen with a flashlight shining off it at an angle but I finally managed to boot into safe mode and back into normal mode. However today upon booting, I found the back-light doesn't work and it could not boot and launched immediately into an endless startup repair cycle. My Lenovo B590 was working fine yesterday when I had an external monitor connected as an extended display with my laptop screen.