Lumia 1020 :: Why Won't Nokia Phone Show Up On Computer

I've tried literally everything. Multiple USBs and computers. Installing connectivity driver. Restart my phone and computers. When plugged in, the phone will only charge. There is no indication on the computer that a device has been connected (I checked Device Manager and it's nowhere to be found, not even under hidden items). When I plug it into my computer, it's the same as plugging it into a wall outlet. I've read tons of solutions online and tried them all. It makes me think that something has gone wrong with my phone. The issue isn't my computer's USB ports or even the USBs I've tried. It sounds like an issue with my phone. When I first purchased the phone, it was able to sync to the computer and I could transfer pictures from it.