since no one else has said this, I feel the need to ask...
did you install the card correctly? you are supposed to lift the slot "cover", then insert the card INTO the Cover, then shut the thing and lock it. if you (...did what I did, and...) tried to install a card without reading the manual first, you might put the card on the board and then try to close the flap over it. that wont work...
heres a snap from page 36 of your getting started guide.
Insert a media card
Use a microSD media card to extend the memory available on your BlackBerry® device for storing media files such as songs, ring tones, videos, or pictures. The media card might be sold separately from your device.
1. Press the release button for the battery cover.
2. Slide off the battery cover.
3. If the battery is inserted, remove the battery.
4. Slide the media card holder door toward its hinges to unlock it.
5. Open the media card holder door.
6. Place the media card into the slots in the media card holder door so that the metal contacts on the media card align with the metal contacts on your device when the media card holder door is closed.
7. Close the media card holder door.
8. Slide the media card holder door away from its hinges to lock it.
9. Insert the battery so that the metal contacts on the battery align with the metal contacts on your device.
10. Slide the battery cover back onto the device so that it clicks into place.
Figure 11. Insert a media card
oops! I cant post pictures yet since I only have 5 posts.. :(
edit. all better now.