Sansa Fuze+ not recognized by Windows 7 (it's not the cable or computer!)

Update! Minutes after posting this I noticed something I had missed — apparently the trouble Fuze is NOT charging when plugged into a computer or the wall outlet. There’s definitely some signal getting through the USB port, because if the Fuze is turned off and I plug it into my computer, it turns on. But it seems like the USB port is not functioning correctly at all. Send it in for repairs?