Compaq Armada m300 Compaq Armada M300 Series of Personal Computers Maintenance - Page 47

Table 2-19, Solving USB, Problems

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Table 2-19 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 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 An unpowered hub is connected not work. to another unpowered hub. Use only powered hubs. Make sure that all unpowered hubs are immediately preceded by powered hubs in the USB chain. 2-24 Troubleshooting

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2-24
Troubleshooting
Table 2-19
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 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.