How to Always Boot Mac OS X in Verbose Mode

Mar 25, 2007 - 23 Comments

Finder Booting Mac OS X as usual shows the Apple logo and eventually you’ll wind up at a login screen or desktop, that’s attractive and all, but some users would prefer to see what’s going on behind the scenes. That’s what Verbose Boot Mode does, it shows you what is really happening during system startup on a Mac, and is great for troubleshooting purposes, but it can also just be interesting to see what exactly is going on during the OS X booting process.

Typically, if you wanted to boot in verbose mode on a per boot basis you would hit Command-V during startup, which brings up the familiar white on black console looking screen with a lot of scrolling text. On the other hand, some users may prefer to always see the complete verbose booting process on every boot including all kernel extension loading, details, and system messages on boot, and to do that you can adjust the firmware from the Terminal with the nvram command, as we’ll cover here.

Turn On Always Verbose Booting for OS X

Simply execute the following nvram command at the Terminal to enable verbose boot mode and set it to ‘always’ (meaning every system boot is verbose by default):
sudo nvram boot-args="-v"

Disabling Verbose Booting on the Mac

Equally simple is the ability to disable verbose booting, which will basically make OS X boot as normal – this is the default boot behavior of every Mac:
sudo nvram boot-args=

Check current nvram firmware boot settings

If you’re curious what the current firmware nvram settings are, type the following:
nvram -p

That will show you the current nvram parameters, indicating if something like verbose mode or safe boot is enabled, but you’ll also see some other data there too that may appear as gibberish – for our purposes here you can ignore all that and just focus on the boot arguments.

What is Verbose Boot Mode?

Verbose boot mode is helpful when troubleshooting your Mac, particularly when used in conjunction with OS X safe booting. It allows you to see everything your Mac is doing on system boot, so if there is an error thrown or something going wrong during the system boot process, it’s easier to identify. It’s a text only boot mode, but it will be exited from automatically when the Mac OS X boot process has completed enough to enter into the graphical user interface. This is what it looks like roughly to boot OS X with verbose option enabled:

verbose-boot-mac-os-x

Most users will have no need to boot verbose, unless out of curiosity, or performing some particularly complex troubleshooting or diagnostics tasks on a Mac. Nonetheless, it can be an interesting trick to see what’s going on, and in many ways it resembles looking at a Terminal screen or booting a Linux PC as the kernel details scroll by during the loading process.

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Posted by: Paul Horowitz in Mac OS X, Tips & Tricks

23 Comments

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  1. hmills says:

    I would rather just hit command-v when necessary, I prefer the bells & whistles of a nice spunky graphic splash to some scrolling greek text

  2. anon says:

    For those who want to exercise geekdom without satiating their true inner geek, you can do this and a lot of other stuff using a gui util like OnyX. But this is, of course, “funner.”

  3. [...] Want to always start in Verbose mode? Check out this article [...]

  4. [...] Always boot Mac OS X in Verbose Mode – OS X Daily (tags: mac boot verbose osx computer howto bash apple) [...]

  5. gp says:

    Do you know how to disable the verbose mode definetely? I have activated it on a mb late 2008, and now I cannot disable it anymore… how can I do that?

    thanks
    Kind Regards
    gp

  6. george beard says:

    hi. i have a macbook laptop 2006 13-inch screen……. and i lost my login password plus i lost my startup disc to…. it is anyone there can probably know what to do please help me i do not what to do thank you very much

  7. lol says:

    A statistic:

    Only 1 in 10 dumb americans can spell “definItely” correctly.

  8. veonexus says:

    When correcting others’ grammatical errors, please be sure that your response is correct. Americans is a proper noun so it should be capitalized.

    • zack112358 says:

      When correcting grammatical errors in corrections to others’ grammatical errors, please be sure your response to their response is correct. “Americans” should be quoted.

      • bored123 says:

        When correcting grammatical errors in corrections to other’ grammatical errors in a reply that was supposed to correct errors in another reply, … Oh, I give up.

        • When correcting grammatical errors in corrections to others’ grammatical errors in a reply that was supposed to correct errors in another reply, one must have a correction in mind.

  9. wiltj says:

    could i use this command to reset the PRAM from first boot, as i understand it, setting something like
    sudo nvram boot-args=”-p -r”

    should reset the PRAM, and then would allow the system to boot normally( as the command would wipe its self out)

    why i ask?
    my mini no longer lets me reset PRAM from either a wired, or a wireless keyboard.(target disk mode works, option boot wont)
    but all keys work fine once the OS is booted. :( any help please!
    -w

    • arfour says:

      Much too late for you, but maybe someone else will find this useful…

      I have run into this many times. It seems like certain Macs (generally older Intels and most PPCs) simply will not take the PRAM reset key combination (command+option+p+r) or recognize an “option boot” from anything but the Apple white + clear plastic keyboard. The Aluminum keyboards just won’t do this on these machines.

  10. [...] MIGHT be it: Always boot Mac OS X in Verbose Mode – OS X Daily [...]

  11. Ben Martin says:

    Just what I needed. Thanks!

  12. Pie says:

    ok i type -v NOT -V does that matter?
    after some scrolling text the screen goes black but my PC is still running cause it has the light on and i can here it like usually. whats going on here?

  13. [...] Verbose mode can be useful when troubleshooting Macs and developers often use it too. The standard user probably has no need to be in verbose, but it can still be fun to look at the underpinnings of Mac OS X. If you just hold down the key combination, your next reboot will be normal again, but you can also set your Mac to always boot in verbose mode. [...]

  14. [...] Always boot Mac OS X in Verbose Mode sudo nvram boot-args=”-v” and to remove: sudo nvram boot-args= (tags: OSX Unix tutorial) [...]

    • Savvy_bob says:

      Just download Onyx for either Tiger or the newer version for Leopard +. There is a box to choose which mode you want it to start up in. WARNING… Not recommend to start up in single mode. Also for you Mac lovers that don’t want Spotlight to index anymore there is a box to un-check also in Onyx. So much easier than hacking up your registry.

  15. Lingesh says:

    I want to reset my password in verbose mode. How can i do it?

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