Strange Issue With Booting Windows (works after cold boot but not restart)

Discussion in 'Mac Pro' started by robbier, Nov 2, 2011.

  1. robbier macrumors member

    Apr 27, 2008
    I am currently experiencing a very strange issue regarding booting into Windows. If I restart my Mac Pro, hold down the option key, and select my Windows partition, I get a black screen and the fans spin up. However, if I completely power down the machine and cold boot it, I am able to hold down the option key and select Windows and boot successfully. So, essentially, I am able to boot into Windows only after a cold boot, and not a restart due to the aforementioned problems. Although not particularly serious, I would like to fix the issue as it is pretty annoying.

    This same issue occurs even when trying to boot to the Windows 7 installation DVD, so I doubt it has anything to do with my Windows installation. I am guessing it has something to do with the BIOS emulation function of EFI and something about rebooting vs. cold booting, but I am not completely certain. Any help is appreciated.

    Thanks so much,
  2. ActionableMango macrumors G3


    Sep 21, 2010
    What happens if you select Windows as the boot partition from within OS X and restart instead of restarting and selecting with the keyboard?
  3. robbier thread starter macrumors member

    Apr 27, 2008
    Thanks for the suggestion. I just tried that and got the same result. The computer rebooted and I got a black screen. I had to hold down the power button to manually shut off the computer, and after turning it on, it booted into Windows just fine.
  4. Demigod Mac macrumors 6502a

    Apr 25, 2008
    PRAM reset:

    Boot Mac. Hold down the keys: Command Option P R. Release keys after the second chime.
  5. robbier thread starter macrumors member

    Apr 27, 2008
    I thought I would post a little update to this situation. I have been fairly busy over the past few months and haven't had much free time, but I just started working on this issue again a short while ago. I did reset the PRAM multiple times, and that didn't seem to help much. I tried installing a boot utility called "BootChamp," and I am having the same problem even when using that utility. I think I even tried repairing the disk as well as the disk permissions for both my Mac HDD and Windows 7 HDD, but, again, this booting issue didn't go away.

    I did call Applecare and they suggested reinstalling Windows 7 because, according to them, this is an issue with my particular Windows 7 installation. However, I have already ruled that out because I tried rebooting into the Windows 7 installation DVD (a known good copy of windows) and I still get this issue.

    Thanks again for any help!
  6. ActionableMango macrumors G3


    Sep 21, 2010
    I'm a complete amateur at this, but the next thing I'd suggest is testing all your memory.

    This is coincidentally identical to a problem I had many years ago rebooting from Red Hat to Windows. Windows would not load from a Red Hat reboot. It would only load from a cold start or a Windows reboot. In my case, switching video cards solved the symptom. I never found out what the actual problem was; the video card worked fine in all other aspects so I don't really think it was to blame.
  7. dreko macrumors newbie

    Dec 31, 2011
    This is what I do....

    I've also experienced the same problem

    I haven't found the EXACT cause but for me:

    I disconnect 1 firewire drive
    I start tapping/holding down the ESC key as soon as it reboots/or coldboots

    You'll get a black windows boot screen, I select win 7 os and proceed fine from there...

    good luck
  8. initialsBB macrumors 6502a

    Oct 18, 2010
    I have this weird problem when selecting the windows partition by keyboard and hitting the return key blocks the computer on the black screen. Turns out that using a wired USB mouse to select the windows partition and double clicking works every time...
  9. robbier thread starter macrumors member

    Apr 27, 2008
    Thanks for all the replies,
    I will try the mouse suggestion and escape key suggestion tonight. I did also test the memory using the Apple Hardware Test and it didn't find any issues, so I am not sure what is going on here.

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