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The startup chime always plays through the internal speakers, even on desktop models. This is a feature of the firmware and can't be helped. But you can mitigate it. Macs remember the different volume levels for the internal speakers vs. the headphone jack, and it saves this information to the PRAM. So all you have to do is unplug your headphones (that's ...


You can disable the hardware startup chime by changing the firmware variable SystemAudioVolume. To disable the chime execute from the command line sudo nvram SystemAudioVolume="%80". To return the chime to its default state execute sudo nvram -d SystemAudioVolume. More information about the nvram command can be found in its manual pages (man nvram).


To shed some light on the presence of a Windows selection at Option-startup, Winclone restored the Windows 8.1 image to the new Mac in EFI mode, which writes the boot data to disk0s1, the EFI partition. Deleting a Boot Camp partition in Disk Utility will not remove the boot information from the EFI partition. In cases where Windows will not be restored or ...


Apple is aware of this and states "This is normal behavior for an IPS display, and the faint image will disappear over time." Unfortunately, it seems that nothing can be done to solves this. Possibly take it to an Apple store and describe the issue - see if they can give any recommendations.

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