2009 Imac GPU upgrade gone wrong

Discussion in 'iMac' started by stereo247, Oct 11, 2014.

  1. stereo247 macrumors newbie

    stereo247

    Joined:
    Oct 9, 2014
    #1
    Hi All

    Newbie here. I fitted a "working" HD 6970m which I got off eBay. I can get it to show the initial boot screen but then the screen goes goes blank/white.

    I then tried booting and holding the "Alt" key and successfully get the different drive options. I can choose which ever. I can boot into windows (I hear the chime when I press the power button and the machine powers down). If I try any of the other drives including a Yosemite install USB eventually the boot fails and sometimes gives "boot disk not found" message.

    Does this mean the card is busted as per the latest Apple card swop deal on these or is there something else a-foot that I'm missing?

    I am running the Yosemite beta and machine is an i7. Thanks for any help.
     
  2. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #2
    Did you flash the card's ROM with an EFI?
     
  3. jji7skyline macrumors 6502

    jji7skyline

    Joined:
    Aug 10, 2011
    #3
    How would one do that?
     
  4. stereo247 thread starter macrumors newbie

    stereo247

    Joined:
    Oct 9, 2014
    #4
    I second that request. Thought that because it was pulled from a mac it would just work... please let us know how to do this.
     
  5. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #5
    I don't know how to do it either, all I know is that it has to be flashed with an EFI.
     
  6. Neodym macrumors 68000

    Neodym

    Joined:
    Jul 5, 2002
    #6
    Varying information on the net (from "get an old windows notebook with compatible MXM slot for flashing" to "place firmware files in OSX folder so the iMac does it"), so you need to read yourself into the topic a bit (seems to depend to a certain extent on the exact hardware you have).

    Only had a quick glance at the sources mentioned below, but think you could use them for starters (especially Netkas is _the_ authority in Mac video card flashing, however quite technical, so you may want to further search Macrumors as well):

    MacRumors

    Netkas 1

    Netkas 2 - Ultimate (iMac) MXM efi rom thread
     
  7. stereo247 thread starter macrumors newbie

    stereo247

    Joined:
    Oct 9, 2014
    #7
    Awesome links man - will let you know how it goes! Thanks.
     

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