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I've installed Windows 7 on my Mac with Boot Camp and I had Dual Boot on my screen when I want to select to chose Operating Systems. Yesterday, when I turned on My MacBook Pro (MD 322) it boots up with Windows 7 automatically. I think my OS X installation is damaged and I can't check the OS X partition in Windows.

What can I do?

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up vote 4 down vote accepted

Open the control panel and in the search box in the upper right, type boot camp. You should see the Boot Camp disk drive icon below. Open it and it let you change your boot partition.

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I could not find something similar in my control panel. – Mohammadhassan Esfahanian Sep 17 '12 at 13:16
@MohammadHasanEsfahanian - This means you didn't install Windows through boot camp. Which means your OS X installation is gone. Which means you will have to install it again. – Ramhound Sep 17 '12 at 13:55
Thank you and +1 @NicoleHamilton. I find it finally. – Mohammadhassan Esfahanian Sep 17 '12 at 19:15

Try this;

  1. Turn off your Mac
  2. Turn it back on and soon as you strike the power button, hold the Option button until you see the screen giving the choice of booting with your OS X or Windows

Hope it will help.

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Restart the Mac, when it boot press the "ALT" key The computer will start and give you the option to choose wich OS to boot into.

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