Wait for your computer to boot into the operating system. Select the main hard drive, usually called Macintosh HD, and press the "Return" key. When the Startup Manager displays, use the left or right arrow keys to cycle between hard drive options. Start the computer as normal and hold down the "Option" key as the computer starts. This issue usually affects computers with more than one hard drive. When you hear the start-up chime a second time, release the keys.Īfter resetting the NVRAM, you may need to select the startup disk. Sometimes you need to restore the NVRAM to get your computer functioning again, reset the NVRAM by powering down the MacBook restart and immediately hold down the "Command-Option-P-R" keys simultaneously.
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