Dell Precision 533CX Setup And Quick Reference Manual page 13

3
Monitor
Align and gently insert the monitor cable to avoid bending connector pins.
Then tighten the thumbscrews on the cable connector.
NOTE: If you are only using one monitor with an optional dual-monitor card,
you must use the primary port. To enable dual-monitor support, both monitors
must be attached when the computer starts.
For setting up dual monitors, see "Dual Monitors" on page 17.
optional secondary port
primary port
Setup and Quick Reference Guide
13