I was messing around with the startup partition on my Windows 7 partition on my Mac and accidentally changed it to the Mac OS X partition. So when I boot the Windows 7 partition it says the error message "Missing Operating System". This error also shows up when I try to boot the Windows 7 DVD from the Mac drive selector screen. My question is how do change the boot partition on my Windows 7 partition if the partition won't even boot? I really don't want to install a new Windows 7 partition.

Mac Specifications:
Type: Mac Pro (Mid 2012)
Processor: 3.33 GHz 6-Core Intel Xeon
Memory: 32 GB 1333 MHz DDR3 ECC
Graphics: ATI Radeon HD 5770 1024 MB
Software: OS X 10.8.4 (12E55)

  • Hi and welcome to Apple.SE. Could you please edit you question such that it actually contains a question? I can see what you want to do (boot into Windows 7 again), but it is better when you state it yourself such that people don't have to guess. – Saaru Lindestøkke Aug 13 '13 at 9:28
  • 1
    Thanks for correcting me. I edited the description and added the question that I'm seeking. – JordanDevelop Aug 13 '13 at 9:34
  • So you press and hold Option while the system is booting, you then select the Windows 7 DVD, what happens exactly? It goes straight to a screen stating "Missing Operating System"? – tubedogg Aug 13 '13 at 21:35

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