black screen notebook n55sf, suddenly black screen

hello and hai..

i using n55sf core i5.

i have problem with my screen

last night i used my laptop with battery, then my battery weak and it suddenly black screen automatically.. maybe because battery to low, because already warning.

so i just put the laptop beside my bed

then today when i plugin supply and open it, the screen not display anything.. but when i used external monitror. it display.


so any ideal or sugestion??