Here's my problem. I came into the production studio this morning after a 3 day weekend and discovered a problem with our Yamaha O2R: I couldn't record with it, or hear anything coming out of it. I tried to record with a microphone but got nothing. I put on an mp3 file and tried to play it through the desk. I noticed the signal light (beneath the gain control) was lighting up, but neither this channel nor the stereo channels were metering on the meter bridge. I was the last person to use the desk last week and no settings were adjusted on the channel or in the master area. I have done a scene memory recall, pressed the flip button, and played with most of the buttons in the master section. Again I must point out that I used the desk last and did not adjust anything out of the ordinary. It seems to me like its a routing problem or something. Would love some help on this.