Acer 12000 User Manual page 13

2. Carefully press down the Pentium II Xeon processor until it is
properly inserted into the socket.
3. Use the retention mechanism cover to secure the processor by
pressing it down until it locks with the retention mechanism as
shown below.
Figure 1-7 Installing Retention Mechanism Cover
The retention mechanism cover only fits one way. Both shafts of the
retention mechanism and the retention mechanism cover have a O
and a OO sign. Match the O on the cover with the O on the retention
mechanism first, then hooked them together and then insert the OO
side to the retention mechanism and make sure they are clipped.
1.6.3 Removing an Intel Pentium II Xeon processor
Follow these steps to remove a Pentium II Xeon processor:
System Board 1-13