I have a new-ish (one month or so) Due that was working yesterday, but today is not detected by the PC when I connect it to either the programming or native port. By "not detected" I mean that the arduino is not displayed when I run lsusb (Ubuntu linux) and there are no /dev/ttyACM* device files created. Likewise, there are no messages generated in /var/log/syslog when I plug/unplug the device. When it is connected, both the L and On LEDs are illuminated and no others. I have tried pressing reset, erase, and both; nothing seems to help.
Is this a Brickduino? Are there any other options for troubleshooting it?