Results 1 to 8 of 8
  1. #1

    Globesearch's Avatar
    Member Since
    Jan 28, 2007
    Location
    Sydney, Australia
    Posts
    5
    Specs:
    Black Macbook 2GHz
    Macbook won't start after being connected to a powered USB hub
    Hi there.
    I connected a powered 4-port USB hub to my macbook and it stopped working. Then I discovered that the power adapter for the hub was a 12 volt adapter.

    When I start the Macbook it spins up for a second and then dies. At the same time the screen briefly flashes on - then nothing.

    Have I damaged something by connecting an over-powered USB hub?
    Is there a remedy for this, such as some form of reset, without having to send it to Apple to replace cooked parts?

    Thanks.
    Globesearchneye:

  2. #2


    Member Since
    Oct 27, 2005
    Posts
    4,702
    Quote Originally Posted by Globesearch View Post
    Hi there.
    I connected a powered 4-port USB hub to my macbook and it stopped working. Then I discovered that the power adapter for the hub was a 12 volt adapter.

    When I start the Macbook it spins up for a second and then dies. At the same time the screen briefly flashes on - then nothing.

    Have I damaged something by connecting an over-powered USB hub?
    Is there a remedy for this, such as some form of reset, without having to send it to Apple to replace cooked parts?

    Thanks.
    Globesearchneye:
    G'day Globesearch & welcome to Mac-Forums.

    I'm sorry I can't give you a definite answer but you really need to work through the troubleshooting steps:

    Basic OS X TroubleShooting

    Let us know how it goes or if you need further help.

  3. #3

    Globesearch's Avatar
    Member Since
    Jan 28, 2007
    Location
    Sydney, Australia
    Posts
    5
    Specs:
    Black Macbook 2GHz
    Hi Marty and thanks for your reply.
    I've tried the process in your suggestions, but the macbook won't do anything beyond a short spin of the HD and a quick flash of the screen. It then stops with a weird little squawk and then nothing.

    I really think I've cooked something.

    Any further thoughts?

    Thanks
    Peter.

  4. #4


    Member Since
    Oct 27, 2005
    Posts
    4,702
    Sounds grim ... I suppose the recommended Adaptor is less than half what you sent through your MacBook?

    So you reset the Open Firmware and zapped the PRAM ... Have you tried booting from your Install CD/DVD?

  5. #5

    Globesearch's Avatar
    Member Since
    Jan 28, 2007
    Location
    Sydney, Australia
    Posts
    5
    Specs:
    Black Macbook 2GHz
    Well, I think the hub was supposed to operate on about 5 Volts and 500mA, but I fired it up with an adapter which pumped out 12 volts and about 1 amp.

    Unfortunately, it won't start for me to be able to do anything with PRAM or firmware - and of course it won't accept the startup DVD.

  6. #6

    cazabam's Avatar
    Member Since
    Jun 06, 2006
    Posts
    1,153
    Specs:
    MacBook 2.0GHz White, 512MB RAM, 60GB HDD
    I'm not sure how you could cook the machine by connecting it to a powered hub. The power from the hub's supply goes to the peripherals, not back to the host machine. If the hub came with a 12V supply, that's what it's meant to have

    A couple of things to try (assuming you haven't already) is to plug it in with the power brick and press and hold the power button until you hear a long beep. This should let you get as far as hardware diagnostics, at least. Other than that, call AppleCare.

  7. #7

    Globesearch's Avatar
    Member Since
    Jan 28, 2007
    Location
    Sydney, Australia
    Posts
    5
    Specs:
    Black Macbook 2GHz
    Hi Cazabam,
    I gave that a try, but once again, it just did the same thing as before and died again.

    Could the original attempt have caused a short circuit somewhere?

  8. #8

    Globesearch's Avatar
    Member Since
    Jan 28, 2007
    Location
    Sydney, Australia
    Posts
    5
    Specs:
    Black Macbook 2GHz
    Thanks to all the kind folks with the suggestions for my problem. The machine was under warranty, so it's now with an approved repairer.
    Thanks again.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. powered usb hub
    By Mac9346 in forum Other Hardware and Peripherals
    Replies: 3
    Last Post: 12-14-2012, 05:55 PM
  2. keyboard and mouse won't work with powered usb hub
    By nordy69 in forum Other Hardware and Peripherals
    Replies: 8
    Last Post: 04-29-2009, 04:24 PM
  3. Powered USB Hub and G5
    By stoneinapond in forum Other Hardware and Peripherals
    Replies: 0
    Last Post: 05-21-2008, 05:56 PM
  4. need compact bus powered USB 2.0 hub for macbook
    By nick_harambee in forum Apple Notebooks
    Replies: 2
    Last Post: 10-23-2007, 03:45 PM
  5. printing thru powered usb hub
    By marsmensch in forum Other Hardware and Peripherals
    Replies: 0
    Last Post: 08-02-2007, 09:49 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •