Are there limitations on file size, or something. I knew which formats I can use, so that's not an issue. The issue is that when I put an mp4 on my Evo, it will show up as a black screen with only the audio playing. Those were with larger files, approximately 1.6gb, and 2.3gb. I did get a a smaller file (about 20mb) to play, although the audio was off. So, my question is, what am I doing wrong?