Lenovo ThinkCentre E73 Hardware Maintenance Manual page 90

3. At the rear of the computer, remove the screw that secures the PCI Express card latch.
Figure 14. Removing the screw that secures the PCI Express card latch
4. Depending on whether you are installing or replacing a PCI Express card, do one of the following:
• If you are installing a PCI Express card, remove the appropriate metal slot cover.
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ThinkCentre E73 Hardware Maintenance Manual
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