Audio Alchemy DDE v.3 Dac problem

I have a problem with an Audio Alchemy DDE v.3 Dac. The LOCK light under STATUS on the front display stays lit for both INPUT 2 and INPUR 3 even though there is only one digital input being used. (either a coaxial or I2S bus cable is connected to the DDE but the LOCK light stays lit for both connections). At present I'm getting no sound from the DDE v.3. This problem likely originated when I hooked up both a coaxial and a I2S cable to the DDE while the DDE was powered up. The manual says never make these connections while the unit is powered up. Is there a way to correct this problem so that I can get sound again?