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Do you mean it plays some music or video but can't play other music or videos? If my understanding is right, you'd better check whether the card works on another phone. If it works, you can try installing a third-party player to your S5.
Might need to be formatted as Fat32 and not NTFS or other filesystems. Use a computer first to format the SDcard and then transfer your Mp3's to it. Then use your phone's media player to play the files.