Only thing I can help you with for certain is that the black bin needs to be down any time you want to put the top down. Putting the bin down creates a storage space for the top. Without that bin down, the top won't move, but the windows will go all the way down if you're trying to lower the top via the door lock. If you've only been using the interior switch, I suggest you try lowering the top via the key - just turn it (clockwise, I believe) and hold it. Then the top may go down.
If that doesn't do it, then wait here for someone to respond or do some serious searching on this site. There are plenty of threads about this. Sounds like a bad position sensor to me.
I love my car as much today as the day I bought it