Lenovo THINKCENTRE 8804 - Manual (Page 38)

3. Disconnect the fan assembly cables from the system board. See “Identifying
parts on the system board” on page 4.
Note: Make sure you note the location of the fan cables when you disconnect
the cables from the system board.
4. Remove the front bezel by releasing the tab as shown and pivoting the bezel
outward from the bottom.
5. Remove the plastic fan insert behind the bezel by releasing the tabs as shown.
30 Hardware Replacement Guide