Hello Lindsay. I just shipped out a bunch with the mod pre-done, but I think yours was from before that. If you only see ONE black wire on the back, then yes... you should do one of the two fixes described throughout this thread
. I'll repost the two options here. Which you choose is a matter of preference as they both work. The resistor mod (first picture) is conceptually easier for many people but involves getting the resistor. The second mod involves no other parts but I think some people might find it a higher degree of difficulty (I'd still say well within most people's reach though).
If you think you can do either and you want a recommendation... I lean toward the second fix and the preferred one.
PS. Incidentally, for anyone ordering one from now on
... Rev 2.1 is on its way and of course this has already been fixed.