Troubleshooting 12-23
Writer: Karen Williams Saved by: Rebecca Wiggins Saved date: 01/26/98 11:52 AM
Part Number: 203118-001 File name: Ch12.doc
Solving USB Problems
Continued
Problem Possible Cause Solution
External device
connected to USB
connector does not
work during
startup (before
Windows 95 loads).
During startup, only
two tiers are
supported by the
USB connectors.
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 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
appears on the
display although
the external device
was previously
recognized by
the system.
The device was not
connected to the
same USB port.
No reconfiguration is
necessary. Click Cancel or
Finish to close the message.
Connect the external device
to the other USB connector.
Five tiers of USB
external devices
function normally,
but external
devices in the sixth
tier do not work.
The operating
system on the
computer supports
up to five tiers.
Replace some of the hubs in
the first five tiers with hubs
containing additional
sockets. Connect the
external devices in the sixth
tier to the new hubs in the
first five tiers.
Connect some of the
external devices in the first
five tiers to other connectors,
then replace them in the
USB chain with external
devices from the sixth 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
preceded by powered hubs
in the USB chain.
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