Lenovo ThinkCentre M90 Hardware Maintenance Manual page 134

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See "Opening the computer cover" on page 102.
3. Remove the front bezel by releasing the three plastic tabs and pivoting the front bezel outward.
Figure 68. Removing the front bezel
4. Pivot the optical drive bay assembly upward.
5. Locate the system fan. See "Locating components" on page 103.
6. Disconnect the system fan cable from the microprocessor fan connector on the system board. See
"Locating parts on the system board" on page 104.
7. Release the four tabs on the bottom of the system fan as shown, and then lift the system fan straight up
to completely remove it from the chassis.
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ThinkCentre Hardware Maintenance Manual