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I chose the wrong partition to install Windows on my MacBook Pro Retina.

How do I reinstall Mountain Lion? I tried ⌘R but the only thing I get is:

No Bootable Device -- Insert boot disk and press any key

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Since Boot Camp sets your Windows partition as the Startup Disk, some keyboard commands on boot become very temperamental or may not work at all.

Try holding ⌥ alt on startup - see if you can select the recovery partition.

If not, you might have to re-install the OS from disc or external drive.

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