MacBook Pro - Black Screen

Hi all, I have a MacBook Pro (13-inch, Mid 2010). I am unable to see display on the screen but I could hear fan running noise. I did/observe the following:

- blank screen,

- blank external video output,

- front LED on,

- could hear Supredrive initial move,

- fans spinning as normal,

- could hear HDD spinning but no normal activity observed

- zapping PRAM didn't help

Could someone help me to resolve this issue?