Sony VPCZ11PGX User Guide

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Troubleshooting >
Port Replicator
Port Replicator
Why can't I use my TFT/DVI monitor connected to the DVI-D port?
When you use the DVI-D port on the port replicator, select the SPEED or AUTO mode with the performance selector switch. 
See Selecting Performance Modes 
 for mode selection.