Compaq Armada E700 Compaq Armada E700 Series Reference Guide - Page 139

Solving USB Problems

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Solving USB Problems Solving USB Problems Problem Possible Cause Solution External device connected to the USB connector does not work. The computer is running Windows NT 4.0. When the computer is running Windows NT 4.0, only two tiers are supported by the USB connector. These tiers can include no more than two hubs on the first tier and no more than one keyboard and one pointing device on the first or second tier. External device During startup, only Use the external device only connected to the two tiers are after Windows 95 or USB connector supported by the Windows 98 has loaded. does not work USB connector. during These tiers can startup (before include no more Windows 95 or than two hubs on Windows 98 loads). the first tier and no more than one keyboard and one pointing device on Reduce the number of connected external USB devices to no more than two hubs on the first tier, and no more than one keyboard and one pointing device on the first or second tier. the first or second tier. A New Hardware Found message displays although the external device was previously recognized. The device was previously connected to a USB connector on a docking base. No action is required. Connect the external device to the same USB connector each time. External devices in Windows 95 and the sixth tier do not Windows 98 work. support up to five tiers. Replace some hubs in the first five tiers with hubs containing additional sockets, then connect the devices in the sixth tier to the new hubs. External devices in lower tiers do not work. An unpowered hub is connected to another unpowered hub. Connect some external USB devices to other connectors. Use only powered hubs. Make sure that all unpowered hubs are preceded by powered hubs in the USB chain. 17-24 Troubleshooting

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17-24
Troubleshooting
Solving USB Problems
Solving USB Problems
Problem
Possible Cause
Solution
External device
connected to the
USB connector
does not work.
The computer is
running
Windows NT 4.0.
When the computer is
running Windows NT 4.0,
only two tiers are supported
by the USB connector. These
tiers can include no more
than two hubs on the first tier
and no more than one
keyboard and one pointing
device on the first or second
tier.
External device
connected to the
USB connector
does not work
during
startup (before
Windows 95 or
Windows 98 loads).
During startup, only
two tiers are
supported by the
USB connector.
These tiers can
include no more
than two hubs on
the first tier and no
more than one
keyboard and one
pointing device on
the first or second
tier.
Use the external device only
after Windows 95 or
Windows 98 has loaded.
Reduce the number of
connected external USB
devices to no more than two
hubs on the first tier, and no
more than one keyboard and
one pointing device on the first
or second tier.
A New Hardware
Found message
displays although
the external device
was previously
recognized.
The device was
previously
connected to a
USB connector on
a docking base.
No action is required.
Connect the external device to
the same USB connector each
time.
External devices in
the sixth tier do not
work.
Windows 95 and
Windows 98
support up to five
tiers.
Replace some hubs in the
first five tiers with hubs
containing additional sockets,
then connect the devices in
the sixth tier to the new hubs.
Connect some external USB
devices to other connectors.
External devices in
lower tiers do
not work.
An unpowered hub
is connected
to another
unpowered hub.
Use only powered hubs.
Make sure that all unpowered
hubs are preceded by powered
hubs in the USB chain.