Working now. I took it out of the case, detached and reattached it. They just must not have seated it well. Thanks.
This is a very cool little device, btw. It's not much bigger than a pack of cigarettes and half as thick, so it's very portable. I actually have the 60 GB model, not the 40. Just plug into the usb port and you're good, don't have to mess w/a power cord. I was thinking of buying a 32 GB flash drive, but a good one costs upward of $60. This has twice the storage and is just as convenient, great for transferring files between my computers at work and home.