Dell OptiPlex DCP Guía De Referencia Rápida página 11

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NOTE: If your system has two video connectors, the integrated video connector is
disabled and has a protective cap on it. Use the expansion card connector, as shown
in the last illustration in step 3.
NOTE: If your system has two audio connectors, use the one on the expansion card,
as shown in the last illustration in step 4.
or
or
video connector
on expansion card
or
Setup and Quick Reference Guide 9