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

During startup, only two tiers

Use the external device only

USB connector does not

are supported by the USB

after Windows 95 or Windows

work during startup (before

port. These tiers can include

98 has loaded.

Windows 95 loads).

no more than two hubs on the

Reduce the number of connected

 

first tier and no more than

external USB devices to no more

 

one keyboard and one

than two hubs on the first tier,

 

pointing device on the first or

and no more than one keyboard

 

second tier.

and one pointing device on the

 

 

first or second tier.

External devices in lower

An unpowered hub is

Use only powered hubs.

tiers do not work.

connected to another

Make sure that all unpowered

 

unpowered hub.

hubs are immediately preceded

 

 

by powered hubs in the USB

 

 

chain.

2-26Troubleshooting

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HP E700 manual Solving USB Problems, External device connected to a USB connector does not work

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