Kay ~

If it's a "SanDisk" Brand card -
here's their Product Support web site >>>

http://www.sandisk.com/retail/support.asp

Sadly they don't list a 1-800 # to call

Check the "Warranty" page for the EXACT model card you have -
if it's within the Warranty Period -
(AND you can find a sales receipt for the card) -
you might want to send it to them under the warranty.

Long & Short of it is that they do ~
Just Go Bad
and there's No Way to "fix" it if the card has actually "failed".

But TRY to Re-Format it with the card reader -
might work!

Then be sure to TEST IT before you count on it for any Good Pix!