Another thing to try: make sure you’re not putting the cable in upside down. It can easily go in but won’t work. Reverse it and see if it doens’t magically works for you.

Boy, DO NOT disrespect that cable. My BT went out and then when I played with it too much my airport went out. Was scared, but pushing it gently around got it working. Don't pull UP on this cable at all, pull to the left.

Unfortunately, when I added a second hard drive via these instructions, all went well but Bluetooth is now MIA. Can anyone help?