Usb ports put out power but nothing is recognized.

I just bought a used Fujitsu T3010 off ebay. It is a tablet pc.

My problem is that the usb ports put out power but do not recognize anything being inserted in the ports. I know they are putting out power because when I attach my PDA the charging light comes on but the device is not recognized by the operating system. It is like nothing was ever inserted. No " bleep" sound like when a new device is plugged in, not even a single message or anything.

I have gone into the Device Manager and looked at the usb root hub listings to see if they recognize anything but they do not. It says there is 0 ma being drawn fromt he port. ( There is more than that because the PDA is charging.)

Does this sound like a dead usb port to allt he experts out there? I need to know so i can try getting an exchange from the seller i bought it from. i only have a couple days to send it back.