I just bought a new Adafruit Flora board, and I haven't been able to get it working successfully. When I plug it into a USB port, the board seems to be getting power (the green PWR LED is illuminated), but there is no other output from the board. The Arduino IDE also does not recognize the board (the "port" menu under "Tools" is grayed out), and I have tried to connect to it on both Windows and Linux (Ubuntu) systems with the appropriate drivers/packages installed (including the Windows drivers and the board manager add-on in both installations of the Arduino IDE). I've also verified that the USB cable I'm using can handle data.
Previously, I was able to at least get the board to be recognized in the IDE on my Linux machine, and the red LED did light up, but after disconnecting it doesn't light up anymore (unless I try to reset the board, which makes the red LED pulse a few times).
Anything that I can try to get it recognized in the IDE?
Edit: I'm able to see the board pop up under "ports" in the IDE immediately after I hit the reset button on the board. However, as soon as the red LED stops pulsing (I think this means that the board is finished rebooting), it disappears from the list of available ports. It's also mounting under /dev/ttyACM0, not the usual /dev/ttyUSB0.