Thanks for posting and welcome to the Bose Community. I am deeply sorry to hear that you are having this issue and would love to assist you further.
The amber LED means that the system is muted and the speakers are silent, this happens when there is no audio from the source. I would highly recommend that you perform a reset on the system via:
Turn off the device connected to the system
Unplug the power cord of the system from the power outlet. Wait 30 seconds
Reconnect the power cord
Retest the system
As well as connecting the companion to another USB port to ensure that this isn't causing any issues. Please also check to ensure that the volume is adjusted on both the PC and the Companion. The Volume can be adjusted on the Companion by turning the Volume Control Ring.