essa

Park my car overnight and in the morning when I started my car, there's no sound coming out of any speakers and head unit said "No CDC". After doing a little bit of searching, I found a thread about possible fix by removing the fuse. I removed the both stereo and radio fuses (#64 and #26), waited for 30 seconds but still no luck.

Can anybody please tell me:

1. What should I do next to troubleshoot my problem (is there a fuse for the amplifier itself or other fuse that I don't know)
2. What could be the problem
3. How can I find out which part is faulty (head unit, amplifier and fiber optic cable)
4. If the problem is the amplifier, can I just replace the H/K amplifier with an aftermarket amplifier
5. If the problem is the fiber optic cable, Where can I buy the replacement cable?

BTW, I have the Harman Kardon system and my 05 C230K is already out of warranty. I'm trying not to bring the car back to the stealer if I don't have to.

Thanks guys.