I've tried multiple cables and multiple computers, all of which have recognized my phone and facilitated file transfers in the past. At some point, not exactly sure when, the phone just stopped popping up on any computer I plug it into. It charges just fine, both when plugged into the wall or a computer's USB port, but never shows up as a drive and the phone never gives any indication of USB connection options like it used to.
As I said, I've tried multiple computers and cables, tried uninstalling and reinstalling and updating drivers, and I've also tried installing KIES, which I have no interest in using, but was just hoping it might work... No go on anything.
Factory reset is my next attack method, but I'm waiting for all my stuff to back up via wi-fi first. Is there anything else I'm missing that I can try first? It'd be nice not to hassle with a factory reset if it could be avoided.