Dell OptiPlex 330 User Manual page 240

7 Check all cable connections, and fold cables out of the way to provide
airflow for the fan and cooling vents.
8 Replace the computer cover (see "Replacing the Computer Cover" on
page 257).
NOTICE:
and then plug it into the computer.
9 Connect your computer and devices to their electrical outlets, and turn
them on.
See the documentation that came with the drive for instructions on
installing any software required for drive operation.
10 Enter system setup (see "Entering System Setup" on page 79) and select
the appropriate Drive option.
240
Desktop Computer Parts
To connect a network cable, first plug the cable into the network device