Support sd card will not mount to phone.. help?

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http://androidforums.com – OK so I had this phone for a month now and its been fine until one day it says I need to mount my memory card and I did but it will not recognize it and when I look at the storage data on the SD card it says there's 0 memory on it. But I checked and it still had all the memory on it. I used factory reset and it still didnt work. When I click on an app that uses a SD card it says no external storage available. I need help because this Is bugging me out. :( (General)