I think most likely your drive is broken, and you will need to take it back, or buy a new drive. I had the exact same problem as you, but with the new 204N which I only bought today, took it back and the new drive was fine.
I imagine these drives are not very strong, and when moving it got damaged. I was careful with my drive whilst transporting it home, but I guess it was damaged in the shops hands.
Try to test it on a friends PC, but I’m guessing its broken like the one I had.