So Lastnight I was working on a project on my B+ which has had a slight suspect usb power port, which I found only 1 good short USB cable that would work on the PI (all the rest I had just didnt seem to power the PI properly) that was about 4" long from a Nokia. For my project I built a GPIO plug in PCB which has power Jack and connections to I2C and some other stuff for my project, meaning I no longer needed the USB power. My mistake was leaving the USB cable plugged in.
So I set it updating and maybe 3/4 way through its process I moved the thing slightly and it seems the outside of the little USB cable plug shorted out some of the pins on the network socket.
I was running headless and it looked like the Pi had Frozen so I did a full power reset, from which point I can no longer see it on the network (I had been using a WiFi Dongle) Havent tried a network cable yet or plugging it in to a monitor to see what it actually does, but I know it still runs as I have a python program that runs at start up and displays the time on a little display, which is still working.
So I wondered how quickly you could break the network/USB hub? I did wonder if because my PI hasnt had a full update for a while if it might have just switched SSH off as I know that was a new thing.
Also does anyone have any direct pin connection point diagrams for the points on the underside so I can maybe solder in a little multifunction hub direct if the one on board is toast?