Alpine cdm 9823 does not make any sound at all everything but it does not sound at all

This may have one or two things going on here:

First, do you have car ampifiers in the vehicle? If so, this is an indication that the problem might be with and amp....check power and connections at the amp.

Second, it may be a radio setting. In the settings menu on the Alpine, there is an option to turn the internal amplifier on/off. Make sure that it is set to on or you'll have power and no sound.

Third, you may have a speaker short or bad speaker somewhere. To protect it's internal amplifier, the radio will turn off the sound output when it sees a speaker is shorted or grounding somewhere in the system. This can happen when a speaker's voice coil goes bad or when a speaker terminal contact is touching metal somewhere in the car.

If none of these ideas points to the solution, I'd recommend visiting a local car stereo shop to have them further troubleshoot. Hope this information was helpful.