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Was there an error message presented? The exact and complete contents of that would help greatly.
Have you tried a different card?
Have you tried that card in a different device?
The answers and results from all of this will guide to the correct root problem.
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.