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HP Recommended
If this is a T520, the most common cause of failure is a bad usb firmware key, which is installed on the mainboard. Replacement part number is CQ890-67105 and you can order from the HP Parts Store. Avoid 3rd party resellers online as they are usually 2-3 times more than HP direct. There is a slight chance it could be the main board but in most cases it is the USB and it is fairly cheap and easy to install.
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I am a volunteer, offering my knowledge to support fellow users, I do not work for HP nor speak for HP.
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