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Make sure the lock notch on the memory card is in the unlocked position. it is a small notch on the one end of the card, should slide back and forth lock/ unlock. if this doesnt work try to put the memory card in a card reader and see if you can browse files on the card, if you cant, the card is probably gone bad..
You need to isolate the problem. Try connecting the Sandisk M2 into another phone or computer (using an adapter). If this memory card is detected by other phone or computer, then you may want to insert another memory card into the problem phone to test it.
If the problem phone works using another memory card, but the problem memory card also works using another phone, then you may want to format first your Sandisk M2 before using it.
This may have something to do with how the m2 card is formated. PC systems such as FAT32 and NTFS do not work with cameras or telephones as the data cards in these devices are formatted to FAT16 or lower. In order to read the card when you placed it in your PC FAT32 would have been used.
If you are prepared to loose the data on the card I suggest you use a PC to re-format it to FAT16, your phone should then recognise it again!