The easy way to fix for your Computer or Laptop Monitor Display issue....

System  Slow..!?!?!?!?

When your computer goes black after starting up, it may be because of your system might be very slow. You can wait for few moments to get the screen. If not you can hard restart(press power button continuously for 5 to 8 seconds) your system and start it again.

Computer Asleep:

When you go away from your computer for a moment and come back and the screen goes black, you can try moving mouse or cursor point or try pressing random keys to get the screen.

 

Improper connection:

May be improper connection from the CPU to the monitor issue will be occurred. Check the data cable or power cables if the connections got short circuited. Also check the light on the monitor to makesure the connection is proper.

Change a cable:

If your monitor getting power(i.e you getting LED light on) but screen is off, it may be because of faulty power cable, Change the cable and check once.