Hello, this similar question had the following best answer:
I turned off my computer than unplugged cable and took out battery, held down power button for 1-2mins and than put everything back in (battery and charger) and tried to start it...the screen was still black.
I then turned it off again, then pressed ESC, while holding down ESC I pressed and held power button until it briefly turned on and back off.
Then I let go of both the buttons and pressed power back on and VOILA the screen came back on.
Make sure your charger isn't loose, and than you're aren't surging too much power through the outlets-sometimes these can make the screen black too.