The only last thing I might try would be swapping stations; by swapping the 12f unit with the 15f unit's power cable (since that 15f is running a-ok) you can at least rule out if the 12f's power cable is the culprit or not, and/or contributing to the unit hanging at boot. :sorry
Otherwise send it in with a note with your name, return address, contact info, and a brief description of the issue (or link to this thread) to our SVC Center: 4400 NW Pacific Rim Blvd Camas, WA 98607. :capt
Thanks,
- Maggy :sail