I had the same problem this afternoon, here is what I did. I bet you are having the same problem that I did.
Put it in the right way and it wouldnt see it. I had to put it in and then push it in quite hard (thats what she said) until it flashed that a media card was inserted and then I quickly closed the little cover and its been fine ever since
Not this best method but its the only thing that would work for me,