Install active sync on your computer, connect cradle to computer etc.
Explore phone. if your storage card is being picked up you will have a folder called storage card. I put my mp3's in a folder within My Documents on the card. Windows media player should be able to see these. You might also want to install All explorer program on your phone, it comes on the SD card given free, if you have deleted it you can get those programs from www.acrossthewater.co.uk/spv
it will let you explore your phone and give you details on how much space you have left on your card. if you can find your mp3's on the card just select and play them from within explorer. If you can't see your card from either of these programs you may have an incompatible/duff card
I saw this in a movie about a bus that had to SPEED around the city, keeping its SPEED over fifty. And if its SPEED dropped, the bus would explode! I think it was called "The Bus That Couldn't Slow Down".