Step 2: Then click the disk you usually use to start your Mac. For this problem, take the following easy and quick steps: Step 1: Select System Preferences from the menu, and click the startup disk. The only way I've been able to control which OS starts up is to restart from the Boot Camp control panel in OS X in either OS. When you see a flashing question mark Macbook pro for a few seconds and start, it’s most likely that the system failed to find the startup disc. I've tried pressing the keys from before the startup chime and just after. I've tried hold down each of the two option keys and I've tried holding down both at once. This is true whether I'm starting from the shut-down condition, or restarting. I'm finding that holding down the option key has no effect - the machine boots into whichever OS was last running. This displays icons for all available startup disks and lets you override the default setting for the startup disk that is in Startup Disk preferences (OS X) or the Boot Camp control panel (Windows), without changing that setting.ġ Restart your Mac and hold down the Option key until disk icons appear onscreen.Ģ Select the startup disk with the operating system you want to use, then click the arrow beneath the icon. You can select which operating system to use during startup by holding down the Option key. Select an operating system during startup I have Windows 7 installed on a 15-inch Retina MacBook Pro.Īccording to Apple's Boot Camp Installation and Setup Guide, pg.
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