MacBook Pro cannot see external hard drive and usb

Discussion in 'Mac Notebooks' started by johnjohn773, Nov 10, 2016.

  1. johnjohn773

    johnjohn773 New Member

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    Hi All,

    I am using a MacBook Pro with OS X 10.9.5.
    I have a 1TB external hard drive formatted to FAT32 and a 64GB USB stick also formatted to FAT32.
    When I plug either of them into the USB port, nothing happens.
    They do not get automatically mounted, they do not appear in Disk Utility, when I open the Terminal, they are not listed when I type "diskutil list", and no new disks or any entries appear under /dev/

    I have an iMac which has no problem mounting reading/writing both the USB stick and the hard drive, so they seem to be fine.

    I considered it being a USB port issue, but I have a 8GB USB stick formatted to FAT32 which mounts on the MacBook with no issues.

    Please help me find a way to resolve this.
    Thank you in advance for your feedback.
     
    johnjohn773, Nov 10, 2016
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  2. johnjohn773

    oldscribe VIP Member

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    Hi,

    I would first do an SMC reset, then see what happens.
     
    oldscribe, Nov 10, 2016
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  3. johnjohn773

    johnjohn773 New Member

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    Hi oldscribe,

    I did an SMC reset by turning off the MacBook, holding shift + control + option + power key, and then releasing all of them (while the power adapter was plugged in). The adapter light changed from orange to green and then back to orange as a result.
    I have never before done and SMC reset, so I am describing it here in case I have done it incorrectly.

    However, there was no effect on the Mac's ability to recognize either the USB or the hard drive. All the symptoms remain the same as I described in my previous post.
     
    johnjohn773, Nov 11, 2016
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