hello, i got a toshiba a215 s5837 that is over heating and turning it self off. i looked by the air vents and its caked full of dust and stuff. i went to take off the bottom of the laptop and it wont come off, all of the screws are out from the bottom. does any one know how to take off the bottom of this laptop to to to the fans area so i can clean out the dust and stuff.