why Laptop Screen Goes Black ?

[bruce2011]

2 Reasons for Black Laptop Screen Problems.
one of the most common reasons why a laptop screen goes black is because of impact damage. This can happen when the laptop is accidentally dropped or bumped into.

Apart from a cracked screen & display chip damage, the whole monitor goes black and doesn't respond when turned on.
If the damage is superficial, you can get away with simple screen replacement... Get a replacement screen from Ebay and install it in place of your damaged laptop screen.
I've done this on laptops ranging from Dell, HP, Acer and Toshiba. Just make sure you get a screen that's compatible with the monitor size & cable connectors of your current laptop.

Another reason for laptop screen problems is a failed backlight bulb.

Think of the backlight as a thin fluorescent tubelight that powers up the monitor screen. Most backlight bulbs have a lifespan of 3, 5 or 7 years but you might notice the screen go dim & dark as early as 2-3 years.
A failing backlight can also give out a pinkish hue which means all the colors on your screen become pink.

Remember that just as your laptop screen goes black, it can also go white. Black screen is a sign of backlight failure while white screen indicates a loose connection between the video cable and the laptop screen.