mmadhankumar said:
There are many reasons which could cause this.
tell me whether you could see any light on the screen when you boot up.
Also try to increase the brightness of the screen using the keys on keyboard and check you see any changes (like the black screen getting darker or lighter). this is to check whehter the backlight is gone or not
When i boot up i see light in scrren and backlight is working.
But nothing seen in screen.