Double-click or press the Return key to start up your Mac from the volume you selected. Use your mouse or trackpad, or left and right arrow keys to select the volume you want to use. If you don’t see the volume you want to use, wait a few moments for Startup Manager to finish scanning connected drives. After a few seconds, the Startup Manager appears. Immediately press and hold the Option key. Use these steps to choose a startup disk with Startup Manager: Startup Manager allows you to pick a volume to start from while the computer is starting up. Temporarily change your startup disk with Startup Manager 
The next time you start up or restart your computer, your Mac starts up using the operating system on the selected volume. Select your startup disk from the list of available volumes.
Click the Startup Disk icon in System Preferences, or choose View > Startup Disk. From the Apple menu choose System Preferences. I have been searching through Apple Support but am not getting past this.Set the default startup disk You can change the startup disk your Mac automatically uses from System Preferences. Next, I reboot and get back to the OS X Utilities window and select Restore, when I get to where I am supposed to select a startup disk, there are no options shown If I select disk0, all the buttons are grayed out After verifying, the button for repair disk is still grayed out. When selecting “Mac OS X Base System”, I do see Verify Disk as an option and when I click on that, it shows “the volume of Mac OS X Base System appears to be ok”. We have used command R to boot to the OS X Utilities window and have tried the following:įirst, Disk Utility, where it does show the hard drive as “disk0” and “Mac OS X Base System”. She has the flashing ? inside a folder when she turns on the mac. I am looking at a 13” macbook pro (2012 I believe) that belongs to a family friend who is not good at keeping backups.
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