Hi, New to this forum. My husband and I purchased a used Bryston BDP2. We connected it to the home stereo. The Dac is Theta Generation 8. All the connections are right. But the BDP2 starts and shows an "A" on the bottom left corner, where it is supposed to be a "U" as the manual mentioned. Any ideas as to why there is this letter? We put in a stick with playlist, it detects it, we see it on the display, but it will not play any sound. I have read the manual, online, nothing mentioning the "A" or why it would not play.