3 hard drive cage
4 M2.5 x 5-mm screws (2)
14. Remove the two M2.5 x 5-mm screws that secure the floppy drive cage to the system board, and lift the floppy drive cage out of the bottom case.
15. Remove the two M2.5 x 5-mm screws that secure the hard drive cage to the system board, and lift the hard drive cage out of the bottom case.
1 battery connector cover
2 headphone/microphone
bridge
16. Remove the battery connector cover by lifting the cover out of the bottom case.
17. Remove the headphone/microphone connector cover by lifting the cover out of the bottom case.
1 M2.5 x 4-mm screws (6)
HINT:
The M2.5 x 4-mm screws are silver.
18. Remove the six M2.5 x 4-mm screws labeled "circle L" that secure the system board to the bottom case.