Yesterday I got in my car and unit started up as it always does. I get perfect sound from unit when in Radio mode, all sounds, voice navigation and tones. When I switch to any other source, ipod or dvd/cd and such, I lose all audio? If I switch back to FM or AM it comes right back.....

Any Ideas?

Change your Auto Ant setting to PWR. If it works, then your amp is wired incorrectly to the Auto Antenna wire instead of the remote amp power wire. they are both blue, but one has a white stripe.