Bootcamp problem Mac Pro 3,1

Discussion in 'Mac Pro' started by ashman70, Oct 7, 2015.

  1. ashman70 macrumors 6502a

    Dec 20, 2010
    I have a Mac Pro 3,1 with an SSD installed in the upper bay alongside my optical drive, the SSD is connected to SATA port A on the motherboard. I am attempting to install Windows 7 via bootcamp however the second option in bootcamp, Install or remove Windows 7 is greyed out. I have Yosemite installed and up to date. Why is the option in bootcamp greyed out and how can I get Windows 7 64bit installed on this Mac Pro?


  2. PitBullCH macrumors newbie

    May 14, 2015
    If I remember rightly, it has to be installed on a disk that is potentially bootable - which from an internal disk perspective means one of bays 1-4 - cannot be from disk 5/6 which are usually installed in the optical drive bays.
  3. haralds macrumors 6502a


    Jan 3, 2014
    Silicon Valley, CA
    Correct. That port can be used for booting OSX, but is not configured under BIOS emulation.
  4. ashman70 thread starter macrumors 6502a

    Dec 20, 2010
    I don't think thats true because years ago I had this very same Mac Pro model with the same setup and did it, I just can't remember how, but thanks.
  5. 66318 macrumors regular

    Jan 31, 2006
    To get SATA ports 5 and 6 working, you need to enable AHCI support. For the installer, it would require changing it to run AHCI during the install process, probably by loading the right drivers.

    An alternative would be to install it while the drive is connected to bay 1-4, enable AHCI post install, then move the drive.

    Hopefully my own fuzzy memory here added enough keywords to help find the old solution. Looked at my Win10 install and realized it's not in AHCI mode. Not sure if I'm going to try and change it.

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