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After changing active partition operating system not loading?

I was trying to install dual boot osx and windows xp. In the tutorial I had to make a partition and change it to active. Then I'm suppose to restart computer and install from USB. But I put it in wrong so the USB doesn't install the operating osx operating system. Everytime I open computer now it says error loading operating system. How can I change it back so it loads the old partition?

2 Answers

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  • 7 years ago

    When you changed your "partition", basically, you formatted your hard drive, you messed up your MBR. You will need to re-install your OS.

  • 7 years ago

    you need partition magic or a similar program

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