to Mark,
Band is plugged in to Mixrack, When the band is rehearsing there is a scratching sound coming from the FOH and suddenly no sound coming out at all while the band still playing. The same thing also when I am playing the CD which is connected directly to the Surface the same thing happened sound stop but at the PFL has sound coming out.
Contacted the A&H service rep and they scheduled for their appointment. Will post the diagnostic in few days. Thank you all..
Franklyn