not recognizing

I have 4Gb clip. i loaded about 100 songs from rhapsody on it and it plays in my car radio but not in random and some songs it says no file. I also bought a slotcard with 1000 songs on it. that will play with ear buttons plugged in but not when I plug into my car radio. The car radio is the newest Kenwood and is supposed to play mp3, ipod etc. Any suggestions?

If you are connecting the Sansa through the USB port of your car stereo you cannot play the songs on SlotRadio card. Additionally, your car stereo might not be capable of playing DRM files that is why some songs are not working. A work a round is if your car stereo has a aux in jack, you can use a 3.5 mm male to male cable so that all songs will play.