So you use capital letters in the model number but not at the start of your sentence and you leave out a question mark? At least have the courtesy to do those small things... turn your computer on, listen to where the whirring sound comes from, and look for a slight outdent (is there such a thing?) and see if there is a screw around that area. Before I can assist any further, it would be easier if I could see a picture of the underside of your computer.