I plugged in my Due tonight and found, to my dismay, that it was no longer functioning.
I had been using it to control an array of LEDs via 3 74HC196 shift registers two days ago, and it was working fine then, nothing was changed in that time (that I know of).
Now, when connected to USB (with no IO pins connected) the 'ON' and 'L' LEDs glow dimly before fading out. When plugged in to the computer, the "device connected" sound plays, then the "device disconnected" sound follows around 10 seconds later. This is on a Windows 8.1 which I was previously using with no trouble.
If I plug in the barrel adaptor at 7.5V (or 9V), the board will stay powered. I am able to hit "Upload" in the IDE and the 'RX' LED blinks rapidly on the board, but then the terminal reads "No device found on COM3". Device manager confirms that COM3 is the Arduino serial port. A similar failure occurs when I use the native programming port, just without the blinking lights.
Furthermore, the ISP region gets hot when plugged into USB, even after the LEDs go blank. When plugged into an external PSU, the entire board gets searing hot. This is probably the most severe symptom.
I've really babied this board and been super careful about ESD and current limiting, this is pretty disappointing. I fear the worst, but maybe there's still something left to try.
Any suggestions?
Update: Looks like the chip is fried. Spoke to a tech at Mouser and got a replacement. Ordering a Teensy while I'm at it 