Turn it off and remove the battery, turn it over and remove the two screws from indicated in the pic below...
http://blog.parts-peo.../IMG_0182-300x225.jpg
Then remove the hard drive from the side by simply pulling it out, then just re-fit it by pushing it back in, replace screws and battery and try the laptop again.
If it still doesn't work then you've either got a faulty drive or a problem with the drive connector on the laptops main board.



