On Sunday, January 22, 2017 7:00:53 AM CET solitone wrote: > Have you tried to press the "Command ⌘" key while turning on the MacBook > with the power button? A screen offering different boot options (e.g. MacOS > on disk, debian installer on DVD) should be displayed.
Sorry, the right key you should press to get that Startup Manager is "Option ⌥"--not "Command ⌘" as I previously wrote. https://support.apple.com/en-us/HT201255
