15-22 Troubleshooting
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Writer: Carey Gregg Saved by: Carey Gregg Saved date: 05/08/00 12:06 PM
Part Number: 170706-002 File name: Ch15.doc
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,
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.
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.
Continued
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