How to manage boot options in OS X with the wireless keyboard

boot-osx-0

As I imagine you already know, Apple offers us different boot options when starting the Mac to solve any kind of problem we have, that is, delete the PRAM for example or simply start the boot options to boot another operating system other than OS X such as Windows if we have previously installed it with Bootcamp.

Even so, there are several keyboard combinations to activate other options such as start safe mode by holding down the Shift key, activate the hardware diagnostics by pressing the «D» key or the Command + S combination to start the single user mode.

However I have noticed that when using the Apple Bluetooth keyboard at times the system ignores the orders given right after reboot or first boot as bluetooth devices are fully recognized after system checks and EFI firmware loading with characteristic sound on boot, so sometimes it will not recognize commands if not you have given time for the drivers to load previously, the best advice being to press the combination of keys that we want once we have finished hearing the start-up sound.

Anyway, it is possible that even letting the startup sound pass do not recognize bluetooth keyboard, so we will see how we can solve this without having to resort to a keyboard with a physical USB connection. The first thing would be to start the system and start the Terminal and later enter this command:

sudo nvram boot-args = »VALUE»

The options to place in the place of «VALUE» would be:

  • -S: Activates single user mode
  • -V: Activates verbose mode
  • -X: Enable safe mode
  • rd = DiskID: Forces a specific partition to boot.

An example to enable safe mode and on a specific partition of a disk would be:

sudo nvram boot-args = »- x rd = disk2s1 ″

From what you know, if you run into problems when it comes to the system I accepted the orders when starting and you need a specific mode, simply with these commands you can do it.

More information - Check the status of your RAM with Memtest

Source - Cnet


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  1.   dwmaquero said

    Yes, very nice but if I force it to start with a USB (for example GNU / Linux), how do I then make it start again with MacOSX?