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I formatted my MacBook Pro Mid 2010 with Windows, now I can't install any operating systems on it.

I tried to install Windows 8.1 on my MacBook, then at the final step I received a message saying that an error occurred and the installation failed.

Now, when I try to enter the Boot Menu the only option that I have is "EFI Boot", so I can't boot anything from my USB or DVD. I don't have them in my Boot Menu at all.

I tried ⌘R‏, but after the download and when I enter the installation it says "The drive is locked.".

Now all I have is a formatted Mac without any Operating Systems or any options to boot anything so that I can install a new OS. I don't know that to do?!

P.S: I didn't use Boot Camp or any other software, just used a Windows bootable device and wen ahead like windows based laptops.

  • How you tried to install Windows 8.1 ? From a USB or DVD? – iEngineer Jan 2 '15 at 7:35
  • @iEngineer I used a DVD – Aras Jan 2 '15 at 7:38
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    Then Try a DVD with Mac OS or a bootable USB with Mac OS. You will find Disk Utility option before the installation process. There you can format or recreate new partitions. – iEngineer Jan 2 '15 at 7:40
  • @iEngineer The problem is I can't boot anything from my DVD or USB. I don't have them in my "Boot Menu"! – Aras Jan 2 '15 at 7:44
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    They will only show if an actual bootable key/disk is in the drive. You've also, incidentally, discovered the hard way that you can't just install Windows on a Mac without Bootcamp. – Tetsujin Jan 2 '15 at 9:45

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