Lenovo IdeaCentre K330B - Manual (Page 45)

Chapter 7. Replacing hardware
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2. Install the two screws to secure the plastic bracket.
Note
Use only the screws provided by Lenovo.
Note 2
Replacement of some models equipped with graphic adapter
bracket is different.
Please remove the bracket first as the following:
1. Remove the screw that secures the bracket at the side of the chassis.