For some reason my unit dont want to read the music files on my SD Card, one day its was playing and it stopped and since then its always loading. I inserted another SD card with pictures and it did not even read it. But when I insert the one with the music it always 'loading'. Can anyone please help me with this one because I really dont know what to do at this point.

If it helps its an AVIC f700bt

try re-formatting and dumping back the tunes to it.