I've had my Apogee Duet for 3 years and it just stopped working. When I connect it to my MacBook, all of the lights on the unit will remain lit, but will not respond to my Mac at all. I've tried a different firewire cable, but it still will not function. I've contacted Apogee Tech Support and they've stated that it may be the firewire circuitry which will require service. Since my warranty has expired, there will be a $75 diagnostics fee, which I assume, doesn't include the actual repair. I've also been experiencing a couple other issues with the Duet for a while, so I am wondering if it will be worth moving forward with the service, or should I just sell it as-is and let the buyer deal with it?