Dell OptiPlex 330 (Late 2007) - Manual (Page 41)

Quick Reference Guide
41
CAUTION:
Ensure that none of the system air vents are blocked. Blocking them
would cause serious thermal problems.
Back Panel Connectors
3 power connector Insert the power cable.
4 voltage selector
switch For selecting voltage rating.
5 back panel
connectors Plug USB, audio, and other devices into the appropriate
connector (see "Back Panel Connectors" on page 31 for
more information.
6 card slots Access connectors for any installed PCI and PCI Express cards.
1 parallel
connector Connect a parallel device, such as a printer, to the parallel
connector. If you have a USB printer, plug it into a USB
connector.
NOTE:
The integrated parallel connector is automatically
disabled if the computer detects an installed card containing a
parallel connector configured to the same address. For more
information, see "System Setup Options" in the online User’s
Guide.
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