Freeze on Start Up... USB related

Discussion in 'Mac Pro' started by iriejedi, Oct 6, 2009.

  1. iriejedi macrumors 6502a


    Oct 4, 2000
    Nor Cal
    I have seen this in the past with other Mac towers so I was able to trouble shoot quickly but now I'm wondering what is the actual cause and thought maybe some could explain.

    My new mac Pro (sorta new Early 2008) - would not boot this morning. It 'bonged' and then sat at the Grey screen. 3 times I tried this and with slightly elevated blood pressure tried with some optimism experience unpluging all USB cords... this would be 23inch monitor plug (for monitor ports) and a mouse in the 2nd back USB slot. I had a new shuffle in the front slot for the first failed start up.

    After being unplugged it worked just fine...

    Anyone have an high level explanation of why a USB device can stop a boot up?

    Thanks for the learning tid bit.

  2. rness024 macrumors newbie

    Mar 4, 2009
    Same problem

    I just experienced the same or very similar issue on my newish (6 months) mac mini. My computer would begin to reboot, and freeze on the apple screen. Right after I unplugged a usb drive that I had in there and it started working.

    I can't explain it, I'm just relieved that it works now. backup in progress.

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