16-30 Troubleshooting
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Writer: Beth Zanca Saved by: J Abercrombie Saved date: 07/01/99 11:12 AM
Part Number: 131511-001 File name: Ch16.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
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.
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.
IMPORTANT: External USB keyboards will not function until the
operating system has been booted.
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