Do you have an sd card reader? It might mount that way and then you can either perform a repair or reformat.
I had two occasions where I deleted music from my sd card on my Droid X via Astro File Manager and it fragmented the card. Made the phone slow, unresponsive and almost unusable. The solution was to use a card reader to copy all the data to my computer, reformat the card and recopy all the data back. Worked like a charm twice.
Now, with my Nexus, there is no sd card, it's all internal memory. Read/write speeds are much faster.
Nope, no SD card reader...although not exactly sure what one would be. I did see this mentioned as a help topic. I do use Astro to access it.
What happens exactly is when I plug the phone via USB into a PC, Windows says there is a problem with the device. On the phone, no longer does the selection pop up to chose the connection type, nor does the USB icon. On a Mac, nothing happens on the computer end.
I have tried two factory resets through settings, and another via the phone buttons. That gives me the icon at first, but no choice. And once I clear the notifications, the icon vanishes, and I'm back to square one with the problem.
The issue is beyond me, and really seems to be a fault with the phone hardware (and or jack). At least the thing charges, and I can remove the SD cards to use them with a USB reader, or use Bluetooth.
So that kind of rules out your theory too Nigerius. With two SD cards, one of which was formatted clean, the same problem occurred.
The other bitch of this is apparently PdaNet is no longer on the Market. I haven't looked hard, but no luck finding it yet. So right there, one of the things to keep me on Android is gone. I did use USB tether though, so cannot really use it now (bluetooth never seemed to work)
*it should be noted that PdaNet via USB tether was the last connection I did with a computer before this problem started*
Thanks though guys!