Try this followind method to get rid of Black Screen Problems.
1 . Take out your Laptop Battery
2. Remove your AC Adaptor Cord, that's the wall power, remove it.
3. Now hold down the Power Button for 30 Seconds
4. Then Plug your Battery and Plug it on the wall power
5. Then Power ON your laptop
if problems persist dont forget to leave some comment to solve your problems.
And I'll post some another tips