Help Moment can't find music

Sir Ike

I downloaded music to my SD card with 1.5 and music player can't find the songs.

Reformatted the card, upgraded to 2.1, downloaded from a different computer 1567 tracts and music player only shows 311 tracks. Plugged in to a different computer, unmounted the card and the computer reads all the songs and plays every one I tried.

I also have a HTC hero with the same problem. HELP PLEASE!!