Okay, I have had my D3 installed in my truck for 6 months or so. Everything was working fine until yesterday. I was driving and suddenly the audio silenced. The display still works perfect and it shows that the cd is still playing but for some reason I have no audio. No navigation guidance, radio, ipod or cd audio whatsoever. I have the system bypassed but there has been no changes to anything since it was installed. Could something just have came loose? Please Help me!

It is installed in an 01 ford ranger w/ alpine type r 12" sub and 2 amps and I wasn't bumping it when it went out

Let's see. Your signal chain is as follow:

D3 -> amps -> speakers & sub.

I am almost certain it is not the speakers because it is unlikely that all 5 of them are blown at the same time.

Next, are the amps. Are they still on? When the amps get too hot, they go into self-protection mode and shut down.

How are your amps installed? Do they share a power source? If they do, then check the fuse near the Positive terminal on the battery. If that fuse goes, then both amps would shut down.

Last thing I would check is the RCA input/output cables.

Oh, you didn't by any chance press and hold the volume button for more than 2 sec? That put the D3 on mute. Not likely, but thought I ask.