I have an older I-pac 28 input board I purchased a long time ago for a project but never ended up using it until about six months or so ago. Initially it worked great but recently it has developed a problem with one of its inputs. While all other inputs give you an immediate response when connected I have one input that doesn't respond until you break the connection. Only after you release the button does it send input to the computer. I tried going direct from the common wire to the input but it does the same thing so it's not the cab. Anyone have any suggestions or is the board basically toast?