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HP Pavilion and Compaq Presario Notebook PCs - USB Devices Quit Working Unexpectedly in Microsoft Windows XP
A USB device, such as a camera, scanner, or printer, loses its connection and stops working unexpectedly. The device may appear to work fine when Windows first starts up but later stops working. Use the steps in this document to resolve this issue.
Disable power management on the USB hub
To preserve power, Microsoft Window XP tries to disable USB when a device is not used. Under certain circumstances this function does not work and may cause USB devices to fail to respond when called. To resolve this issue, disable power management on the USB hub by doing the following:
Click Start, and right-click My Computer.
Click Properties, then click Hardware.
Click Device Manager.
Double-click the Universal Serial Bus Controllers branch to expand it.
Right-click USB Root Hub, and then click Properties.
Click Power Management.
Deselect Allow the computer to turn off this device to save power.
Repeat Steps 5 through 7 for each USB Root Hub.
Click OK, and close Device Manager.
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