External SD not found? Any suggestions?

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http://androidforums.com – Hi all, After rooting my s3 and checking out all of the cool apps and the like, I could no longer see the extSD in ASTRO, so i checked the system, and it said that there was no SD and for me to mount it. I've pulled it out and put it back in heaps of times, so that is out of the question, but it happened out of the blue, as if it were software doing it? Any suggestions please? (General)