8 Replies Latest reply: Oct 11, 2012 5:38 AM by BossOz
BossOz Level 1 (0 points)

Hi all,


after the Montain Lion upgrade (10.8.2) on MacBook Pro retina I'm not able to use USB key and externals HD.

They are not present on the desktop and on the finder sidebar.

Also the input devices (mouse and keyboard) responds late if I don't use them for some time (10/15 sec)...


I don't want to make a clean installation...

Any suggestions?


Thank you very much!


  • Timothy Westman-Barth Level 2 (150 points)

    Does your USB key have a light on it? Does that light turn on when it's plugged in? If not then there's probably a problem with power getting from the computer to the USB key.

    I'm assuming your mouse and keyboard connect via the USB ports, not wirelessly.

    Does the USB key not work in any USB port? Do the mouse and keyboard work fine once you start using them?

  • Barney-15E Level 8 (46,319 points)

    In Finder Preferences, Check the box in General to show HD on Desktop and in Sidebar, select External Disks.

    That will reset the display options to show them all.


    If that doesn't help, I'm not sure what is wrong. However, you normally don't need to do a clean install. You can reinstall right over the top of what is there and that may fix what is wrong.

  • BossOz Level 1 (0 points)

    Mouse pad and keyboard on the laptop.

    I tried to use USB with a virtual machine (Win 7) and them works fine.

    Only under mac.

    Schermata 2012-10-08 alle 15.29.02.png
    The image is in italian language...

    I think is not a power problem.


    I Also checked the option under Finder preferences...

    Schermata 2012-10-08 alle 15.31.01.png

  • the0pticnerve Level 2 (240 points)

    You have an application called Disk Utility. It's in Applications > Utilities. Launch Disk Utility and see if the drive shows up there. Also, try the other USB port on your MBPR.

  • BossOz Level 1 (0 points)

    no USB found...

    Schermata 2012-10-08 alle 16.13.18.png

  • BossOz Level 1 (0 points)


         Upgrading "Little Snitch" I got this error:


    Schermata 2012-10-11 alle 13.39.33.png

    I think this is the right way for my USB.


    Surfing the network I found a problem like this in Snow leopard...

    Any suggestions?

  • Barney-15E Level 8 (46,319 points)

    Download the 10.8.2 combo update installer from the Apple/Support/Downloads section of their website.

    See if installing that will fix the broken bits.

  • BossOz Level 1 (0 points)

    thank you very much!!!