Ensure that the 5-pin midi cables connect; MIDI/IN ->MIDI/OUT and MIDI/OUT->MIDI/IN (a very overlooked issue) if Mac, try MIDIMonitor. http://www.snoize.com/MIDIMonitor/ (free download) Open "Sources" then "MIDI sources", the iCM-1 should be listed here. Ensure that the boxes for these are checked. The window below should display all incoming MIDI data coming from the iCM-1.
Frequently Asked Questions for iConnectMIDI1