Originally Posted By: St_PatGuy
*clunk clunk clunk clunk*

Yeah, that's generally a really bad sound to hear from a computer. Your hard drive controller went bad or the heads are just having trouble tracking. There's not much you can do at that point.

This site has great step-by-step instructions. I recommend using an ice cube tray to sort the screws as you take them out. It'll make it much easier when you have to put them back.