I have the same proble with this guy's link : http://answers.microsoft.com/en-us/...ro-3only/3c11ba02-45d6-47b4-aad7-c70ec50f8acb. The story is all my USB 3.0 devices are working with SP3, all others USB 2.0 devices are not working. My sp3 can't even charge my all iphone(5&6) because of they are USB 2.0, my 5 usb 2.0 disk not working , I reaaly need you guys help. I tried refresh, and then fully reset to the factory default ,still no go. My 128G sp3 bought on Jul 3, 2014 ,but I found my warrenty on microsoft website expired at Sep.1 2015. So I need get it exchanged or not? Thanks.