Hi, try removing Hard Drive completely and starting up computer with hard drive removed.
>>scrap the hard drive method for now<<
EDIT:
Step 1: Try connecting Laptop to external monitor (desktop monitor or whatever you have available) if you have a picture then it is likely you have a problem with your lcd and proceed to step 2.
Step 2:Try the small sleep button that the laptop lid closes - located somewhere just below the screen above the keyboard (sometimes it gets stuck, just poke it a few times gently and see if LCD lights).
Step 3: If you have a picture on the external monitor and still get no response from the laptop lcd, get a flashlight and shine it around the laptop lcd and see if you can make out a picture.
Then update me I'll tell you next step :dirol:
Dansford