Question Samsung Laptop Black display but everything works fine

[harethalm222]

Hi, I haveSamsung NP-R522H When I turn it on It doesn't display anything, RAM/FAN/HDD/POWER/BATTERY All Are fine and working good I tested their voltages and they seem good
What i've tired:

1. Re-program BIOS Card
2. Removed battery
3. Replace ram

It still won't display anything

 

[hang-the-9]

If you hook up an external monitor and use the hotkey display buttons does it show a display? Does the laptop actually turn on with lights/fans running?