5.Position the new memory module over the memory slot. Make sure that the notch 1 on the memory module aligns correctly with the slot key 2 on the system board. Push the memory module straight down into the slot until the retaining clips close.

Figure 13. Installing a memory module

6.Reinstall the PCI Express x16 graphics card if you have removed it.

What to do next:

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

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

Installing or replacing the optical drive

Attention

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

This section provides instructions on how to install or replace the optical drive.

To install or replace an optical drive, do the following:

1.Remove the computer cover. See “Removing the computer cover” on page 14.

2.Remove the front bezel. See “Removing and reinstalling the front bezel” on page 15.

3.Depending on whether you are installing or replacing an optical drive, do one of the following:

v If you are installing a secondary optical drive, remove the plastic panel in the front bezel for the drive bay you want to use. If there is a metal static shield installed in the drive bay, remove the metal static shield.

Chapter 2. Installing or replacing hardware 21

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Lenovo 4221, 4220, 4222, 4215, 4219 manual Installing or replacing the optical drive, Installing a memory module