Nothing at all? No light on the display? Sounds like no power getting through at all, as you suggest.
Otherwise (as you probably already know) these things have sensors here there and everywhere ... door opening, and what-have-you. Some versions even need a PIN.
Good luck with that one, Jim. If I were you I would do a bit more digging before making any financial commitments. At least it sounds like you have another unit if comparisons need to be made.
PS: don't tell me ... the hospital didn't remember the need for a manual (circuit diagrams etc.) when buying these units. It seems like I have heard that drum banging for fifty-odd years!
