AFAIK, there is nothing to it. The backplane normally used with the H786, the H9273, has exactly the same kind of power connector as the one used with the H7861, the H9276 - a terminal block. The pinout is, IIRC, identical. There's also a duPont connector on a flat cable (10 or 12 pin, don't recall off the top of my head), which carries BPOK and things like that, and that also is has an identical pinout. And finally they are the exact same size and shape, with the same fasteners in the same locations. Hence my prior assertion that "have looked at both closely, and verified that they have the same interfaces and physical dimensions, etc, so I think this will work, but I have yet to actually try it [to absolutely verify it]". Although I've just noticed that the BA11-N (the H786/H9273) has an H403-A AC control box, and the BA11-S (the H7861/H9276) has an H403-B. I don't know what the difference is between the two: higher current rating, would be my guess, since the H786 puts out 15A of +5V, whereas the H7861 can do 36A. But no, the BA11-N says its max input is 12A at 120 VAC - although that includes powering an auxilliary AC outlet. The H756 P/S alone draws 5.5A; the H7561 is the exact same. (Wow, double the efficiency...) So the auxiliary outlet must be the difference - sure enough, the BA11-S doesn't have one. So I still think you're good to go! :-) Noel