EDIT: The problem was the cable I was using (see answer below).
I have a MacBook Pro running OS X Yosemite (10.10.1). I connected my Arduino Leonardo to my computer for the first time today (using a Micro USB to USB cable), but my computer isn't detecting it.
When I opened the Arduino IDE I selected Tools > Board > "Arduino Leonardo", but when I try to choose a Serial Port the only options are:
I have tried closing and relaunching the Arduino IDE, disconnecting and reconnecting my Arduino Leonardo, and restarting my computer, but I still only see the four Bluetooth ports.
System Information (aka System Profiler) doesn't show anything connected to any of my USB ports.
Thanks in advance!