Compaq Armada e500 Compaq Armada E500 and Armada V300 Series Maintenance and S - Page 73
Table 2-19, Solving USB, Problems
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Problem 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. Table 2-19 Solving USB Problems Possible Cause Solution The operating Reduce the number of system limits connected external USB external devices devices to no more than connected by USB to two hubs on the first tier, two tiers that can and no more than one include no more than keyboard and one two hubs on the first pointing device on the tier and no more first or second tier. than one keyboard and one pointing device on the first or second tier. 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. An unpowered hub is Use only powered hubs. connected to another Make sure that all unpowered hub. unpowered hubs are immediately preceded by powered hubs in the USB chain. 2-38 Troubleshooting