HELP NEEDED - confused about iMac(2011) & GPU

Discussion in 'iMac' started by seefew, Apr 15, 2018.

  1. seefew macrumors newbie

    seefew

    Joined:
    Mar 21, 2018
    Location:
    Germany, RP
    #1
    Hi Folks,

    I step on the spot and everything I've tried results in a no go

    I hope someone have a hint in the right direction, what I could or must do.

    My iMac is a Mid2011 (12,2), i7-2600, 32GB... and so on
    The original GPU(HD6770M) is in working condition but I like to tinker with my Devices, and a bit more steam under the hood is always fine.
    Now that I have juggled something with various cards, I am now completely at a loss.
    I've tried with:
    a Quadro K3000M with BIOS from MSI & DELL
    a GTX 670M with BIOS from MSI
    a GTX 770M with BIOS from XMG, MSI, DELL
    a GTX 780M with BIOS from XMG, MSI, DELL

    Of course there is no Bootscreen, but that's known.
    However, with OS X Yosemite (10.10.5), the screen stays black with all these cards.
    Tried it whit & w/o the Webdrivers.
    For me completely incomprehensible:
    If I start the iMac with a Debian SSD plugged in, the cards will work,
    I get a picture on the integrated display, the mDP Port will detect a conectet TV

    So what could i do to fix it?
    Hope that someone can or will help me out.
    Greets
    seefew
     
  2. seefew thread starter macrumors newbie

    seefew

    Joined:
    Mar 21, 2018
    Location:
    Germany, RP
  3. bobfa100 macrumors newbie

    bobfa100

    Joined:
    Apr 16, 2018
    Location:
    Renton, WA
    #3
    Upgrade your OS X 10.10 Yosemite to 10.13.4 macOS. Please backup your Mac before any upgrade.
     
  4. seefew thread starter macrumors newbie

    seefew

    Joined:
    Mar 21, 2018
    Location:
    Germany, RP
    #4
    thanks for your reply,
    but I can't recognize why or how should an OS upgrade remedy the Issue?
    especially since it has worked for several users with other versions of OSX already.
     

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