Can only boot Windows when selected at boot time

Discussion in 'Windows, Linux & Others on the Mac' started by ActionableMango, Jul 31, 2015.

  1. ActionableMango macrumors G3


    Sep 21, 2010
    If select Windows at boot time (holding ALT/OPTION), it boots fine.

    If I select Windows via Boot Champ (OSX), Startup Disk (OSX), or Boot Camp Utility (Windows), on next reboot or powerup the fullscreen whitish/greyish screen never goes away and nothing boots up.

    I have Yosemite on an SSD in bay 1 and Windows 8.1 EFI on a separate SSD in bay 2. Computer is a 2010 Mac Pro.

    I switch OSes a lot and it's a hassle to sit and wait, and time the keyboard press, wait longer for the OS options to appear, etc. Obviously I would love it if I could get the usual boot switching methods to boot Windows.

    I've tried clearing NVRAM multiple times. Anyone have any thoughts or helpful tips?
  2. ActionableMango thread starter macrumors G3


    Sep 21, 2010

    ...any thoughts? I don't even know where to begin to troubleshoot this.

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