My Quest puked, too. It decided not to power up anymore. Luckily it was under warranty and they sent me another one. Be sure and not use them on a USB hub. They need a direct connect on the USB on THE BACK of the puter. Pretty junky technology if you ask me. Be prepared to spend an hour on the phone with them.
Most of my problems are downloading and saving/tweaking files. The documentation on the software and hardware are awful. I hope someone can compete with them in the future.