Lenovo ThinkCentre M700 Maintenance Manual page 102

3. If a dust shield has been installed, pull it outward to remove it from the front bezel.
Figure 22. Removing the dust shield
4. Release the three plastic tabs on the left side of the front bezel, and then pivot the front bezel outward.
Figure 23. Removing the front bezel
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ThinkCentre M700 Hardware Maintenance Manual