Laptop screen remains black

HI,
MY LAPTOP IS DELL INSPIRON 15R N5110.MY LAPTOP BATTERY HAS ALREADY BEEN dead/DAMAGED.
WHEN I WAS USING MY LAPTOP ITS SCREEN SUDDENLY GO BLACK AND EVEN AFTER SEVERAL ATTEMPTS OF RESTARTING WITH OR WITHOUT BATTERY HAS GOT FAILED.SO WHEN EVER I AM TURNING ON MY LAPTOP POWER LIGHT IS TURNING ON WITH OTHER 3 BUTTONS ALSO BLINKING WITH LIGHT BUT SCREEN REMAINS BLACK LIKE IT HASN'T GOT STARTED.
SO CAN YOU PLEASE SUGGEST ME THAT WHAT THE ACTUAL PROBLEM I M FACING AND WHATEVER ITS POSSIBLE SOLUTION CAN BE