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Take a look inside the card slot with a bright light (cell phone flash??). Do you see any bent or broken pins?
Ok. That may be the problem (it usually is).Bending them back would be the solution. I use a toothpick.
And be very careful inserting cards after you straighten the pins back.
Let me know if that works.
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If you need further info, just click 'Reply to Expert' and let me know! I'll try and help further.