The picture below shows the illuminated amber LED on the DAC on the top left side of the image:
The amber light can illuminate if one of the power supplies is not powered on. There are no power switches on the DAC power supplies. Confirm that the power cords are securely plugged in on both power supplies. Note that the amber light is not illuminated in the image below:
If the issue continues, contact RSA Customer support by phone, online or by email.