Lenovo ThinkCentre M55e - Manual (Page 26)

2. Remove the front bezel by releasing the three tabs and pivoting the bezel
forward to remove completely.
3. Slide the drive bay assembly forward until the drive bay assembly is aligned
with the two slots on the sides of the chassis and remove the drive cables
from the system board. Then pull upward on the handle 1 on the drive bay
assembly to remove it completely from the computer.
4. Disconnect the system fan cable from the system board. See “Identifying parts
on the system board” on page 4.
5. Remove the hard disk drive. See “Replacing the hard disk drive” on page 8.
6. Remove the two screws securing the system fan assembly.
18 Hardware Replacement Guide