Lenovo ThinkCentre M91p 4524 Hardware Maintenance Manual page 106

6. Lift the small handle
Figure 29. Accessing the microprocessor
7. Lift the microprocessor straight up and out of the microprocessor socket.
Figure 30. Removing the microprocessor
Notes:
a. Your microprocessor and socket might look different from the one illustrated.
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ThinkCentre Hardware Maintenance Manual
1 and open the retainer 2 to access the microprocessor 3 .