IMac won't detect SD card

My iMac won't detect any SD card's. It doesn't seem to matter the size (2GB-16GB) or brand, it is just like I haven't inserted one. I have never used one with it before so it isn't from failing to "safetly remove hardware" and I have tried cleaning the slot (with air can)

Have you checked to see if the SD card reader is listed in system profiler? (apple menu, about this mac, more info button) it should be  listed under Hardware, under USB, it would be labeled some thing like "Internal Memory Card Reader".
If the card reader isn't listed:
Have you tried a NVRAM Reset?
Have you tried a SMC Reset?
If the card reader is listed, but your not seeing the inserted cards:
Have you checked to see if the cards are reconised in Disk Utility? (go to the dock, click on finder, go to the menu bar, click on the go menu, chose Utilties, double click on disk utility) Do you see the sd card listed?

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    Does someone’s post help you? Give them kudos as a reward, as they will do better to improve | Mark it as solved if the solution works for you, so it could be reference for others in the future 
    =====================================
    Sound Enthusiast and Enhancement (Post comments, share mixes, etc.)
    http://forums.lenovo.com/t5/General-Discussion/Dol​by-Home-Theater-v4-for-most-Lenovo-Laptops/td-p/62​...

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