Hi, I have the same issue on my DC3217IYE system where the rear usb ports are inconsistent. Sometime it will work and sometimes it wont detect anything plugged in. I think I found a solution to the issue by removing my Wifi Card from pci-e slot on the system. Removing it seems to fix the issue and all my usb ports work perfectly. I just purchase a new Wifi Card and waiting for it to come to see if it was actually the card causing it or the pci-e slot on the system. My theory is that the Wifi Card maybe using to much power and cause insufficient power to the rear usb ports. The Wifi card I was using was the Intel Centrino® Advanced-N 6235. I am going to replace it with the newer Intel 7260 wifi card which uses less power and see if that resolve the issue.
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