Step 7Edit the Bootloader
paste "sudo nano /Library/Preferences/SystemConfiguration/com.apple.Boot.plist" (without quotes)
enter your password, it will be hidden.
add these four lines if they do not already exist
<key>Quiet Boot</key>
<string>No</string>
<key>Timeout</key>
<string>7</string>
the file should now read:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple$
<plist version="1.0">
<dict>
<key>Kernel</key>
<string>mach_kernel</string>
<key>Kernel Flags</key>
<string></string>
<key>Boot Graphics</key>
<string>Yes</string>
<key>Quiet Boot</key>
<string>No</string>
<key>Timeout</key>
<string>7</string>
</dict>
</plist>
press ctrl+o to save and ctrl+x to exit.
Now when you start you will be present with a list of your operating systems. Just select what you want to boot.
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