So i need to access the bottom of my Macbook mid 2010 logicboard to see the damage. Frustratingly, i am able to undo all the screws bar the ones holdng the fan, and two holding the upper white case. On iFixit, it says to use phillips #00 screwdriver which doesn't seem to be working. So far, the screw is stripped. I have gone to the effort of using all the different phillips screwdrivers in my set including smaller ones, but nothing is working!!!!!! Any ideas why it won't unscrew? Any solutions?