Update:The DVI Molex connector arrived - I've stripped the iMac only to find a completely different wiring colour scheme to before. The black LCD cable data channels are the same as the 17" 1/1.25GHz models, as are the Clock-EDID, Data-EDID and VEDID from the grey LCD cable.The others, I am not so sure about. There appears to be a white, and off white (slightly purple I suppose) connected to the shielding, and then a green, blue, yellow and a reddy pink connected to the motherboard connector as can be seen below:-- EDIT: A whole afternoon later and the green and blue are 3.3V, the yellow and pink are Gnd. Resistors arriving tomorrow to setup VEDID for first DVI test, wish me luck! --As for using the PSU, I have ordered a Gigabyte BRIX J1900 (NUC clone) that runs from 12V, so I can reuse the original PSU.The PSU outputs 12V only, but there are also mysterious blue and white wires - the blue is not marked on the PSU PCB, and the white is marked as l.p.m. (presumably low power mode).When the iMac is powered on, the white cable is at 0v, during sleep and when the iMac is off, it is at 12v. What this actually does, I do not know as all the 12V wires stay hot. Perhaps it switches over to a secondary standby 12V supply from the PSU that pulls very few watts at idle?The blue cable appears to stay at 3.6V regardless of state but only when the motherboard is plugged in. I'm guessing this is the 3.3V line generated by the G4 motherboard.