2GB microSD not responding

I also have a 2GB memory card that is no longer recognized after upgrading to the latest firmware.  Its very strange, when I insert the card not only is it not recognized as memory but the whole user interface is very slow and buggy while the card is in the player.  I spoke to sandisk technical support today and they told me to send it back to the seller for an exchange.  I’m trying to reformat the memory card to see if that makes it work, but I’m having no luck.