Mac OS X: "You need to restart your computer" Alert Appears

In Mac OS X 10.2 or later, the older style kernel panic message is replaced with an alert that says you need to restart your computer.
This article has been archived and is no longer updated by Apple.

You see this alert message:
    "You need to restart your computer. Hold down the Power button for several seconds or press the Restart button."

Figure 1 A kernel panic in Mac OS X 10.2 or later


This message indicates that a kernel panic has likely occurred. To learn more, see technical document 106227, "Mac OS X: What Is a Kernel Panic?"
Published Date: Oct 10, 2016