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External sd card reader not working on imac

2793 Views 9 Replies Latest reply: Apr 29, 2012 1:52 PM by Mike Sombrio RSS
moffneriv Calculating status...
Currently Being Moderated
Apr 28, 2012 5:00 AM

Hello I plugged in my 32 GB sdhc card via an external reader and its contents were deleted by the iMac.  I restarted the computer and tried to read another sd card and the iMac does not even recognize the card and reader.  The power light briefly flashes once.  THis computer has read SD cards for many years without a problem.  Has anyone been able to fix this?

 

Thanks

iMac, Mac OS X (10.6.8), iMac 4,1
  • Mike Sombrio Level 6 Level 6 (9,070 points)
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    Apr 28, 2012 5:08 AM (in response to moffneriv)

    Anytime I deal with usb issues I always suggest resettingthe smc, but I'm going to venture a guess that your problem will be with the card reader not the iMac.

    To reset the smc

    Shut down the computer.

    Unplug the computer's power cord.

    Wait fifteen seconds.

    Attach the computer's power cord.

    Wait five seconds, then press the power button to turn on the computer.

  • Mike Sombrio Level 6 Level 6 (9,070 points)
    Currently Being Moderated
    Apr 28, 2012 9:45 AM (in response to moffneriv)

    There's no driver to update. An sd card is just seen as any other external volume, the reader, to my knowledge, isn't even recognozed until a card is inserted. Are you plugging the card reader directly into you iMac or using a usb hub? If so it might be the hub. Secondly how are the cards formatted? Is it in a format that the mac can recognize?

  • Mike Sombrio Level 6 Level 6 (9,070 points)
    Currently Being Moderated
    Apr 28, 2012 3:06 PM (in response to moffneriv)

    Well first Fat 32 is a compatible format for Macs. Secondly, there are no Mac virus' (yet) so forget about that.

    Because a jump drive works in your Mac I wouldn't suspect a usb problem. But just for giggles why not reset the smc and pram, sometimes that fixes strange problems.

    To reset the smc

     

    Shut down the computer.

    Unplug the computer's power cord.

    Wait fifteen seconds.

    Attach the computer's power cord.

    Wait five seconds, then press the power button to turn on the computer.

     

    And to reset pram

     

    Shut down the computer.

    Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.

    Turn on the computer.

    Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.

    Hold the keys down until the computer restarts and you hear the startup sound for the second time.

    Release the keys.

    Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.

  • Mike Sombrio Level 6 Level 6 (9,070 points)
    Currently Being Moderated
    Apr 28, 2012 3:07 PM (in response to moffneriv)

    Sorry about the smc reset...I forgot that you'd tried that earlier. Reset the pram though.

  • Mike Sombrio Level 6 Level 6 (9,070 points)
    Currently Being Moderated
    Apr 29, 2012 1:52 PM (in response to moffneriv)

    Well I'm glad for you, but these sd card issues are starting to drive me nuts. I'm trying to help on another thread and not having any luck coming to a solution there either. At least you know that your issue was caused by a failing card reader. It seems to be a little trickier with the new macs with built in card readers...oh well I'll keep trying. Thanks dor the check mark.

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