Hi Lee,
Sorry to hear you are having trouble with this.
This unfortunately sounds like a possible hardware fault with the digital audio board.
I would advise you to contact your local distributor which in your country is our distribution partner AM&S.
I have included their contact details below for you:
American Music & Sound
925 Broadbeck Drive Suite 220
Newbury Park
CA 91320
Tel: 800-431-2609
http://www.americanmusicandsound.com/
If you require any further assistance with this, please contact us at support@allen-heath.com and we will be happy to help.
Kindest Regards,
Nicole