Boot into Mac OS X Verbose Mode
Booting a Mac with Verbose Mode can be a helpful troubleshooting trick for some obscure situations where users are trying to determine what is going wrong with a Mac during the system boot process. Just as it sounds, verbose mode is verbose, meaning it lists everything going on behind the scenes, and you’ll watch as items and extensions are loaded into the kernel and OS X proceeds with the boot process.
How to Boot a Mac with Verbose Mode
You can boot into Mac OS X verbose mode just once, meaning on that specific boot, by holding down Command+V immediately after powering on a Mac (or immediately after reboot) – start holding down Command+V as soon as you hear the boot chime.
You’ll know you’re in verbose mode because you’ll see lots of text reminiscent of the command line rather than your standard Mac OS X boot screen. That should look something like this:
Verbose mode can be very useful when troubleshooting Macs and developers often use it too.
Aside from troubleshooting, which Safe Boot mode is often better suited for, the standard user probably has no need to be in verbose boot, but it can still be fun to look at the underpinnings of Mac OS X as they go on during the starting process. 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 if you wanted to always see the text that way.