Symphony I/O not showing up as a USB audio device

Symptom: Symphony I/O is not showing up as a USB Audio Device

Solution: There are a number of logical and easily correctable causes for this.  Please examine the following steps - 

• Are you in the correct AIM (Audio Interface Mode)? Confirm that the SymphonyI/O is in USB AIM and configured properly. Make sure that you've quit all audio apps and that the Sym I/O is powered up. Push in and hold on the right-side front-panel encoder. This will bring you to the AIM selection menu. Scroll to whichever AIM you're trying to use and then push in on the right-side encoder to select the AIM and the Sym I/O will power cycle itself and restart in the chosen AIM.
• Make sure the SymphonyI/O is plugged directly into a USB port of your computer using the Apogee USB cable. If it already is, try unplugging the cable and plugging it in to another port. Wait for the exclamation mark (!) icon to disappear from the front-panel (this means the unit is configured properly). If the "!" icon doesn't go away, make sure you have the current firmware versions on the unit. Launch the firmware updater and see if you need to update. Make sure you have the current software (from the same release as the firmware you have) installed as well. If you're unsure, go ahead and run the software installer again. Restart the computer.
• Try quitting whatever audio app you're using and then unplugging/replugging the Apogee USB cable. Wait for the exclamation mark (!) icon to disappear from the front-panel (this means the unit is configured properly) and then relaunch your audio app and confirm SymphonyI/O shows up as a USB audio device.
• If you have just installed the Symphony Software be sure you did not skip this important Security Step on your Mac.
• Restart the computer.