Dell Precision 530 Guide De Configuration Et De Référence Rapide 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
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primary port
Setup and Quick Reference Guide
13