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
MacOS – Installed Windows in wrong partition and now shows “no bootable device”
bootcampmacmacos
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Best Answer
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.