I recently had the guys at the AT&T shop put in a 4GB memory card. However, when I select the memory card from the menu, it says the card is not ready. Also, when I plug it into my computer with the USB connection, it says I must insert a memory card in order for the music service to work, even though there is a card. I'm pretty sure they put it in correctly, they seem to know what they're doing. Anybody have a similar thing happen?