Perhaps a hard drive activity light.
Hello, New to the group. I have an Aurora R7 with a white flashing light above the optical input. The icon above the optical input that is flashing looks cylindrical. Possibly a battery indicator for the CMOS? I have never noticed it before until tonight. Just looking for confirmation on this theory or is it possibly something else? I did some searching on the net and in the manuals and haven't found anything. FWIW I have an R11 in route. Hopefully see it in the next couple of weeks.  Thanks in advance.       
Aurora R7, flashing white light above optical input