chuck22 , please avoid mass posting in various threads. It only makes it more messy.
Firstly, currently there are no 4GB nano-clone/chipod players. The most it'll support is 2GB.
To verify this, you need to perform a format on your player. The guide is here
http://www.mympxplayer.org/how-to-re...ck-vt2400.html
Next, if your firmware is the 3.5.xx series, it is an Actions based player. It should play the .AMV format. The file conversion guide is here
http://www.mympxplayer.org/how-to-co...-368-vt32.html