Thanks, @lalitk. I'd not realized that the power supply and connector were so standard, but had foolishly assumed that I'd need some sort of special, Chord-style unit. I'll try another power supply tonight and hope it works. As for contacting the company, it honestly never occurred to me, as getting any information of use from a big company these days generally seems out of the question. Perhaps I'm wrong to think that way.
Anyway, thanks.
-- Howard