Dell OptiPlex 780-USFF User Manual page 10

To remove the system from the mounting bracket:
a
Push the quick release tab backward.
b
Lift the system upward until it is free of the bracket.
a
Under Desk Mount Steps
6
Mark the mounting hole locations using the measurements
provided on the next pages.
NOTE: The following tools are required for installation to the desk:
measuring tape, pencil, level.
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b