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Troubleshooting
Symptom Possible Cause Action
Erratic behavior. Unit not receiving
enough power. Use a DC 5.3V power adapter if you
are not already using one. If you are
already using a power adapter,
check that it matches the system
specifications (DC 5.3V), and that it
is functioning properly.
Video doesn’t
displayonsome
ports.
DVI specification of
the source device
doesn’t match the DVI
specification of the
DVI cable and/or the
DVI display device.
There are three DVI standards: DVI-
A; DVI-D; and DVI-I. Make sure that
the DVI specifications of the source
device, cable and monitor all match.
Note: Some monitors are able to
support multiple DVI signals.
DVI-D only supports resolutions up
to 1280 x 1024
No DDC2B monitor on
Port 1. Since Port 1 is the port that supports
DDC2B, there must be a monitor
that supports DDC2B on Port 1.
Port 1 monitor
resolution set too high. The resolution of the monitor on Port
1 must not exceed the maximum
resolution of any of the other
monitors.
Port 1 monitor
resolution not
supported by other
monitors.
The monitor on Port 1 must be set to
a resolution that the other monitors
support.
Mixing of Apple
Cinema Display and
LCD monitors.
The monitors must all be Apple
Cinema Display monitors, or all LCD
monitors.
