We are using a Mac Mini ( new with 10.7x) taking signals from a Miditron board which then controls a large motor via a Cyber Pak Midi/DMX dimmer pack and a MOTU Fastlane midi interface. This is for a student gallery installation. Everything works great as long as the monitor is attached (doesn't even have to be powered on, just attached), but once the monitor is unplugged or not attached during start up, the midi starts to malfunction. I have found a couple of other mentions of Headless Mac Mini issues, but solutions don't seem obvious. At the moment, we have stuffed a disassembled flat screen into the security case, but this isn't a real solution. Any help would be greatly appreciated. Thanks.