Lenovo H520g Desktop - Manual (Page 79)

3. At the rear of the computer, remove the screw that secures the PCI card latch.
Figure 9. Removing the screw that secures the PCI card latch
4. Depending on whether you are installing or replacing a PCI card, do one of the following:
• If you are installing a PCI card, remove the appropriate metal slot cover.
Chapter 9 . Replacing FRUs 75