I have same D630 but with intel graphics.laptop was working fine but after i updated my bios to A17.it was fine and i used it.but the next day i got a blank screen.

I dont know what happened.i tried restarting it couple of times.it again showed display but after that went blank again.However it works fine on externel display.Laptops Screen flashes at very start.I connected it to another D630's screen but problem is the same.

is it due to bios update?it was having A09 bios.