I took my NC back to B&N last night and they were able to reproduce the problem with one of their cables. You were right about the 14 day return, that is exactly what the manager said when he gave me a new replacement NC. So far so good with this one.
On a side note, when I was waiting in line to talk to the Nook guy after I got there, I overheard him tell a customer that the in store warranty would only cover things they could fix there and anything else would have to be through the B&N customer service. That got me worried when I heard that as it brought back images of past warranty return experiences with other companies of waiting for weeks only to be sent a refurb or worse the same unit back with a note saying "could not replicate problem".