Mac Pro 4,1 nvidia 660 NO BOOT OS

Discussion in 'Mac Pro' started by izapp, Sep 30, 2014.

  1. izapp macrumors newbie

    izapp

    Joined:
    May 30, 2013
    Location:
    Crete, Greece
    #1
    I just received a Mac Pro 4,1 8core from ebay.

    It came with ATI HD 4870 512 MB GPU. I bought an EVGA GTX 660 OC 2GB.

    When I unboxed the Mac today I installed straight away the 660 and it booted and worked fine. The Mac pro was loaded with 10.8 OS and I upgraded to 10.9. When I installed 10.9 when it first restarted it never booted.

    What is the issue here? When I was on 10.8 of course I did not have a boot screen but when I upgraded it never loaded the OS.

    I would appreciate your help

    Thank you for your time in advance
     
  2. Parigot macrumors member

    Joined:
    Oct 22, 2011
    Location:
    Montreal
    #2
    Did you try to put back the original video card and give it a try?
     
  3. izapp, Sep 30, 2014
    Last edited: Sep 30, 2014

    izapp thread starter macrumors newbie

    izapp

    Joined:
    May 30, 2013
    Location:
    Crete, Greece
    #3
    Yes, of course. I am running 10.9.5 now with the original card. I just updated 10.9 to 10.9.5. Maybe lack of updates was causing the problem? I have not tried installing the new nvidia card since I updated
     
  4. Macsonic macrumors 65816

    Macsonic

    Joined:
    Sep 6, 2009
    Location:
    Earth
    #4
    Not sure what could be the problem. Your 660gtx should work fine even without a boot screen There is a video HERE about a guy who linstalled an Nvidia non-flashed card on his 2009 Mac Pro.
     

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