If you’re lucky, it should restart into Recovery Assistant. Otherwise advice on how to manage a boot loop or freeze, and how to disable 3rd party kernel extensions.
freeze
How to save the panic log safely. Looking up the immediate cause of the panic, getting OS details, what to see in a memory leak, what task resulted in the panic, and 3rd party kernel extensions.
Using the correct term gets us half way to a diagnosis: kernel panics, freezes, app crashes and unresponsive apps are distinguished here.
What to do when your Mac panics during booting, and enters a boot loop, or when it simply fails to get to the login window.
How to tell apart unexpected quits, WindowServer crashes, kernel panics, and more – and what to do about them.
What is wrong when, out of the blue, the display freezes for ten seconds, then you see a black screen and are asked to log back into your account? Malware perhaps?
Knowing the difference helps you work out what to do in response, and how to work out what went wrong.
What they are, how they’ve changed, how to work out what went wrong, and how to deal with them. No Mac should ever experience a single panic.
Had my Mac frozen, or was it just very busy running tests on the boot disk? When I forced it to restart, what did the log reveal?
Is there anything more irritating than that spinning coloured wheel, or beachball, which stops you from getting on with a task? This explains why, and what to do about it.
The Eclectic Light Company 