I have a 24.4.2AI that had an I/O card installed in the back. I bought a mixer case to store the board, but the mixer wouldn't fit in the case with the I/O card in place, so I took it out and set it aside. When I try to boot the mixer it tells me the I/O cannot be found (of course). My question is this: does the I/O card need to be reinstalled or is there a bypass that will allow the mixer to work without it? I guess I thought the I/O card was simply to connect the mixer to an outboard DAW or such. I guess I was wrong. I have the card and reinstall it but I'll have to modify the road case to accommodate it.