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  1. #1

    Member Since
    Dec 11, 2011
    Unhappy Imac not recognising bootable USB
    Hi, sorry if this question is in the wrong place, I'm having terrific trouble trying to install Snow Leopard.
    I have a blank 16gb USB, I went to Disk Utility, erased, created a GUID partition and then moved onto Restore, I selected the new USB as the Destination and the (mounted) Mac OS X Install.dmg as the Source. I clicked 'restore' and it began 'copying blocks'. This appeared to be successful after about 25 mins.

    My problem occurs at this point, if I go to Startup Disk the new USB Mac OS X install shows up, if i click it and press restart it simply boots back up in Tiger. If I shut down and restart holding Alt no other option appears than the original Macintosh HD (again booting it up in Tiger). It's as if it cannot see there is a USB there at all, but as I say it does recognise it in Startup Disk.

    Is there any reason that the iMac wouldn't recognise the USB? The iMac info is:
    Hardware Overview:

    Model Name: iMac
    Model Identifier: iMac5,1
    Processor Name: Intel Core 2 Duo
    Processor Speed: 2.16 GHz
    Number Of Processors: 1
    Total Number Of Cores: 2
    L2 Cache (per processor): 4 MB
    Memory: 1 GB
    Bus Speed: 667 MHz
    Boot ROM Version: IM51.0090.B09
    SMC Version: 1.9f4

    (not sure if this helps?). I did speak to an Apple tech support man who said there should be no problems with booting from this method (before I attempted it!).

    I have been trying now for 3 days and get the same result each time!

    Can anybody help?

    Thank you in advance.

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    Not sure I understand why you're trying to install Snow Leopard in this manner?

    And, where did the Snow Leopard image come from? A Snow Leopard install DVD is only $29.99 purchased direct from Apple. What's the purpose of booting from a USB flash drive unless your optical drive is not working?

  3. #3

    Member Since
    Dec 11, 2011
    Thanks for replying so quickly, chscag. The story is slightly convoluted, I bought the mac last week from a Chinese chap who is moving back to China, the mac is his girlfriends (who has already moved back), the Snow Leopard .dmg file had been put onto the mac after a clean install of Tiger in case the new owner wanted to upgrade and she took the boxed copy of Snow Leopard with her. I am brand new to mac's, is this the wrong thing to do?

  4. #4

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac, i7 4GHz, 32GB memory, 1TB Blade Drive, OS X.13.4
    You need your own system install disc to install an operating system. And what are the details of your iMac?
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

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