Dell Inspiron 1200 - Manual (Page 32)

6. Disconnect the two M2 x 3-mm screws and the fan power cable from the system board.
.
7. Hold the fan by the plastic housing at an angle to lift it out of the system board.
Installing the Cooling Fan
1. Align the cooling fan with the microprocessor thermal-cooling assembly on the system board.
2. Replace the two M2 x 3-mm screws and connect the fan connector to the system board.
1 M2.5 x 5-mm screws (4)
2 shield retention tabs (3)
3 shield-retention tab slots
1 M2 x 3-mm screws (2)
2 fan connector