Test it...use it in a different BB that has no issues with media cards. Use a media card from a different BB that has no issues in your BB. The results will help you understand if the problem is your device or your media card. If the problem is your media card, replace it. If the problem is your device, see hardware-level support.
Occam's Razor nearly always applies when troubleshooting technology issues!
New to the Community? Click here and also here for helpful guidance. Also please click here for additional 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. If anyone has been helpful to you, please show your appreciation by clicking the button. Need a reference to BB10 OS/SR versions? Click here. Need a specific BB10 AutoLoader? Send me a private message.