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13-20 Troubleshooting
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Writer: Jennifer Hale Saved by: Jennifer Hale Saved date: 06/03/99 3:23 PM
Part Number: 103182-001 File name: Ch13.doc
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 or
Windows 98
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 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.
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.