Solving USB Problems
Problem
Possible Cause | Solution | ||
|
|
|
|
External device connected to a USB connector does not work
External device connected to USB connector does not work during startup (before Windows 95 loads)
External devices in lower tiers do 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.
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.
An unpowered hub is connected to another unpowered hub.
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.
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.
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.
