Several computers cannot recognize my 5s - cannot sync anything from iTunes
iPhone 5s with iOS 8.0
2009 Macbook Pro with OSX 10.9.5
2013 Acer with Windows 8
iTunes 11.4
I have been using a Mophie charging case for months (uses an android-style charger), so I haven't needed to use the original lightning charger in a while. I wanted to transfer my music over today so I bought a new one at Best Buy - I purchased the Apple "Lightning to USB Cable (1m)". Whenever I try to connect my iPhone to either of my computers, nothing happens. They do not recognize the device and won't even charge it from the USB port. The USB cable works just fine when plugged into the wall charger port. My USB ports work fine, and will even charge my old iPod nano with the old 30-pin charger. They also recognize any other device besides my 5s.
When I try and select "Devices" from the iTunes file menu, nothing even shows up. It's like my iPhone isn't even connected.
I have already run through the entire list on this website, to no avail. iOS: Device not recognized in iTunes for Windows
So my computer's USB ports are not the problem. I have restarted both my iPhone and my computers multiple times, to no avail.
Could this be a software issue with iOS 8? A hardware issue? I tried a Walmart-brand lightning cable as well, and that didn't work either.
iPhone 5s, iOS 8