I am using the DVI D #1 port on the monitor.
I am connecting via a an IO Gear DVI swicth to a DELL Latitude E6500 and Latitude D630.
I have tried connecting the monitor directly to to the Latitude E6500 on DVI ports on the monitor.
I have not tried in Safe Mode I will
I will try connecting to the Latitude D630 via the port replicator.