So that AIO is not the one I was trying to fix before.. it came from another source! I’ve switched components with the other one to diagnose the problem and it seems to be the analogue board as when I put the old analogue board into this machine it doesn’t work, but I’m too terrified to try putting this one’s analogue board into that machine in case it damages it! I’ve compared as many components as I can’t find what’s causing the issue, so I’m filing that away under “something to look at another day”