Common reason to computer display again and again Black screen

We are some times ignored small inner but important thing like that 

At first check your LCD power connector its work properly or not 

 There are many type of problem by which happens black screen basically

it does computer software or hardware problem,once time i install
some application then i also faced kind of problem it was challenge to me
as a hardware user may be its hardware problem just decide to insert my
ram clean my ram after after cleaning ram it work well .....