OS X Verbose mode

We previously discussed how booting your Mac into macOS’ Safe Mode can help troubleshoot various issues with your computer. In more obscure situations and borderline cases, however, Safe Mode may not be enough to understand why your Mac freezes or crashes during the system boot process.

Enter macOS Verbose Mode.

Not only does Verbose Mode makes it easy to access detailed status messages as your Mac is starting up, but also lets you see what’s really going on behind the scenes and watch as macOS loads kernel extensions and other startup items.

In this tutorial, we’re going to cover booting your Mac in macOS’ Verbose Mode, explain in which situations it might come in handy and give you some handy tips related to using Verbose Mode.

What is Verbose Mode?

Verbose Mode is like normal booting mode, with one exception: instead of watching the progress bar filling or the spinning indicator spinning, it gives you peek under the hood and see the output of what’s happening every time the system starts up.

As such, Verbose Mode is useful for troubleshooting software issues you may be experiencing with macOS or third-party apps. It’s also indispensable for software development.

How to boot in Verbose Mode

To startup your Mac in Verbose Mode, follow these simple steps:

Step 1: If your Mac is on, turn it off by choosing Shut Down in the Apple menu.

Step 1: Now press the power button to start your Mac.

Step 1: Right upon hearing the startup chime, press and hold the Command (⌘) – V key combination for Verbose Mode.

You’ll know that you have successfully entered Verbose Mode when you see white text appear on the screen as if you were in the MS-DOS text mode from the 1980’s, as depicted on the screenshot at the top of the post.

You will automatically exit Verbose Mode when the Mac’s startup process progresses sufficiently and the macOS login screen or desktop appears.

Tip: If your Mac does not progress beyond Verbose Mode, just press the power button until it shuts down. If your Mac is connected to a faulty external keyboard causing it to detect a wrong key press during boot, unplug the keyboard when booting, use your Mac notebook’s built-in keyboard, or hook up another wired or wireless keyboard.

How to always boot in Verbose Mode

Normally, hitting Command (⌘) – V starts up your Mac in Verbose Mode until next restart.

Making macOS always boot into Verbose Mode involves a little bit of Terminal trickery to adjust your Mac’s firmware with the ‘nvram’ command.

Step 1: Navigate to your Mac’s Applications > Utilities folder and open the Terminal application. Alternatively, click the Spotlight icon in the menu bar and search for ‘terminal’.

Step 1: Type the following command into the Terminal window and hit Return. You might need to provide your Mac’s administrator password.

sudo nvram boot-args="-v"

Executing this command will ensure that every system boot from now on is in Verbose Mode, whether you invoke it manually upon hearing the startup chime or not.

Step 3: To disable automatic booting in Verbose Mode, execute the following command in Terminal:

sudo nvram boot-args=""

Now macOS will start up normally at each booth unless of course you hit the modifier keys immediately upon hearing the system’s boot chimes.

Tip: Using Terminal can be a nice shortcut for starting up a remote Mac in Verbose Mode, especially if it doesn’t have a keyboard attached to it. Just log into a remote Mac using SSH and execute the aforementioned Terminal command.

Things your Mac does in Verbose Mode

Verbose Mode is no different than macOS’ normal booting mode.

In a nutshell, Verbose Mode replaces the startup graphics with a text-only mode to show you everything the computer is doing during the boot process. All Startup Items and Login Items are loaded normally in Verbose Mode, as are required kernel extensions, user-installed fonts, drivers and so forth.

When to boot in Verbose Mode

Some of the situations that warrant booting into Verbose Mode include:

  • If you’re a developer—If you develop software for a living, you’ll want to boot into Verbose Mode to troubleshoot issues with your app.
  • If you have startup issues—Sometimes your Mac may crash during startup and Verbose Mode is one way to troubleshoot a startup issue. In fact, Verbose Mode is especially useful when used in conjunction with macOS’ Safe Mode booting.
  • If you have custom hardware setup—People who hook up specialized peripherals to their Mac, like DJ decks, Thunderbolt drives, digitizers and so forth can identify problems in Verbose Mode by checking out the messages to see if software support for your peripheral has loaded successfully.
  • If you’re curious—As mentioned before, Verbose Mode lets you peek behind the scenes and see what exactly is going on during the macOS booting process.

Again, as no feature is disabled or crippled in Verbose Mode, feel free to use it without fearing that booting in this mode will limit what you can do on your Mac.

Still having issues?

If you’re having issues entering Verbose Mode, or it’s not helping fix issues your Mac may be exhibiting, try the following:

  • I cannot enter Verbose Mode—You will not be able to use Verbose Mode if the Mac owner or administrator has enabled Open Firmware Password Protection.
  • Verbose Mode didn’t solve my issue—Your next best bet is Safe Mode. Learn how, when and why you should use macOS’ Safe Mode. Booting your Mac in Safe Mode loads only essential macOS items, helping isolate any software problems you might have.

Because Startup Items and Login Items are disabled in Safe Mode and certain features are turned off, such as native display drivers, advanced Wi-Fi and file sharing, some apps might not work correctly in Safe Mode.

See also:

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  • Guito Mendez

    Ah… Verbose mode, a Hackintoshers most loved screen.

    • Giacomo Castellucci

      …or the most hated! let’s say it depends on the level of fear of the kernel 😉

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    • jp2002

      waiting for DSMOS…
      Creating B-Tree Catalogue..

      Never can forget my hackintosh days.

  • Anonomous.TECH.man

    My very first MacBook Pro (base model) is supposed to be delivered tomorrow very excited

  • Stefan Verkerk

    Just tested this method, but with the new 5K iMac with SSD, it’s blazing fast. Before I’ve read what’s on the screen, it’s gone. Luxery problem?

    • jaysoncopes

      Haha having the same problem on my top-grade 13in. MacBook Pro

    • Run `sudo dmesg` to see recent kernel messages.

    • RogH

      Same here. How can you read slowtime or is it possible to capture in a log ? I’ve tried filming on my iPhone but still too quick and blurrrd text

  • Nathan

    Haha if you have a SSD this verbose screen goes by crazily fast.

  • Reminds me of good old hackintosh days

  • Moeskido

    In the context you’re using it here, the word is “peek,” not “peak.”

  • Snehashish Panigrahi

    Once you get into verbose mode. Its not happening to come out of that.. Anyone else facing the same?

  • Steve Walsh

    I used sudo nvram boot-args=