Long story short I dropped my PSP everything still works, but the power switch is hard to move and the green LED does not turn on when the PSP is on. I am trying to open it, but I can't seem to get any of the screws out except for the one on the bottom center and I think I may be stripping the screws. The others don't seem to turn at all. Has anyone here successfully opened their PSP? Any tips? What size screwdriver should I use? Don't refer me to the guide on opening it, it doesn't help much.