exactly my point, and since he can't power the ROM that controlls that RAID then it would be broken.
Technically it's not really RAID (or, more precisely, it fits the acronym of RAID but doesn't use a published RAID standard)... that may be where some of the confusion in this topic has resulted.
One possible way to get it working, however, would be to either get a new power cord or find another external drive of the same model; in the former you'd be able to simply use the power cord (assuming that is all that was damaged), and in the latter you could swap the two drives in the "new" external for those from the "old" one.
The first option would be difficult, especially if the adapter is some freaky weird proprietary random thing. laptops have lately been standardizing but I don't think the same has occured with externals. of course, if you get another of the same kind you would probably get a power cord with it, so you could try the first option even with the second.
Not sure about the second option, since being older I don't know if one would be able to find a new unit; a used one would work, of course, for either recovery option.