Compaq Armada m700 Compaq Armada M700 Series of Personal Computers Reference G - Page 177

Solving USB Problems, hubs on the first tier

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Solving USB Problems Problem Possible Cause Solution External device connected to a USB connector does not work. The operating system limits external devices connected by USB to two tiers which 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. 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. External device connected to USB connector does not work during startup (before Windows 95, Windows 98, or Windows 2000 Professional loads). During startup, only two Use the external device tiers are supported by the only after Windows 95, USB port. These tiers can Windows 98, or include no more than two Windows 2000 hubs on the first tier and Professional has loaded. no more than one keyboard and one pointing device on the first or second tier. 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. External devices An unpowered hub is in lower tiers do connected to another not work. unpowered hub. Use only powered hubs. Make sure that all unpowered hubs are immediately preceded by powered hubs in the USB chain. 16-20 Troubleshooting

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16-20
Troubleshooting
Solving USB Problems
Problem
Possible Cause
Solution
External device
connected to a
USB connector
does not work.
The operating system
limits external devices
connected by USB to two
tiers which 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.
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.
External device
connected to
USB connector
does not work
during startup
(before
Windows 95,
Windows 98, or
Windows 2000
Professional
loads).
During startup, only two
tiers are supported by the
USB port. 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,
Windows 98, or
Windows 2000
Professional 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.
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
immediately preceded by
powered hubs in the USB
chain.