Screen display

I left my cell phone charging overnight and when I checked this morning the LED was blinking and the screen was black. If I plug it in again the LED wil turn on as if its charging but nothing will show on screen. Tried turning on and going into recovery mode but nothing happened. I...

my laptop sometimes just doesn't light up the screen even though it's working. then i try to reboot and it won't turn the screen on UNLESS i shut it down again and press power button + d, while is booting. BUT i can only do the power button + d work, only if i remove the cable (leaving the...