Hi Walt,

Believe it or not this could have been caused by a Corrupt MP3. Where did you get this MP3? Did you create it from scratch? Sometimes they can become corrupt and cause the read logic of the HD to error out on too many reads, the O/S of the Tyros4 doesn't know how to recover and thus really just shuts down until you reset the process. I would look carefully at all your Mp3's and check the integrity of them first.