7.Position the new hard disk drive into the hard disk drive bay and align the screw holes in the new hard disk drive with the corresponding holes in the drive bay. Then, install the four screws to secure the new hard disk drive in place.

Figure 36. Installing the hard disk drive

What to do next:

To work with another piece of hardware, go to the appropriate section.

To complete the installation or replacement, go to “Completing the parts replacement” on page 40.

Replacing the front fan assembly

Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentre Safety and Warranty Guide, go to:

http://support.lenovo.com

This section provides instructions on how to replace the front fan assembly.

To replace the front fan assembly, do the following:

1.Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer.

2.Remove the computer cover. See “Removing the computer cover” on page 12.

3.Remove the front bezel. See “Removing and reinstalling the front bezel” on page 13.

4.Pivot the drive bay assembly upward to gain access to the front fan assembly. See “Accessing the system board components and drives” on page 14.

5.Remove the hard disk drive for easier access to the front fan assembly. See “Replacing the hard disk drive” on page 34.

6.Remove the heat sink fan duct. See Figure 18 “Removing the heat sink fan duct” on page 22.

Chapter 2. Installing or replacing hardware 37

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Lenovo 804 manual Replacing the front fan assembly, Installing the hard disk drive