Black Screen Boot

My Dell Latitude 5490 doesn't boot up. Screen stays black. I've tried booting without the battery and without SSD. Same problem. The power on/off button doens't seem to work right either. Any tips? What should I check next to find out what's broken?

My laptop runs great as long as it is plugged in, and left on or in sleep mode. If it gets turned off or unplugged it will not turn back on normally. It used to take 15 minutes up to few hours before the Lenovo logo came on, now it’s stuck on black screen for two days. There is a single BIOS...

Hi All, My Asus Laptop, N76VJ, boots to a black screen, no asus logo appears. The only way to get it to turn on is to remove the battery and charger for about 30 minutes or longer and to then reconnect it to power, it will then boot properly (basically I know if it will boot properly since it...

I have a media pad M1 tab (pretty stone age ik) S8-301u I tried flashing twrp to install a newer android (its already rooted with kingroot) when I didn't find the exact boot img for m tab I download the one for mediapad M2 (using flashify) and now when i press the power button the mediapad logo...