imac keeps freezing no mouse or keyboard

Of course this isn’t necessarily a matter of blame: many of these bugs occur when the app expects macOS to do something one way, and it doesn’t. If an app consistently quits unexpectedly when you try doing the same thing, you can be fairly confident that it’s a bug in that app, and should report that to the app’s developers. Unexpected quits can happen for many reasons, but the most frequent are bugs in that app. This normally results in that app suddenly quitting, so is most often termed an unexpected quit.

So the most common type of ‘crash’ should be one app biting the dust when it has done something wrong. Each app runs in its own separate space, kept apart from other apps, and from protected system space. MacOS has protected areas, including the kernel itself, which apps shouldn’t be able to affect.

when the display freezes and nothing further happens.

when your Mac spontaneously restarts, or shuts down of its own accord, because of a kernel panic.

when the display freezes for several seconds, then becomes fully responsive again this is normally when WindowServer crashes, and worst cases can require you to log in again.

when an app becomes unresponsive to user control and displays a pointer resembling a multi-coloured spinning beachball.

when an app unexpectedly quits, often leaving you with an alert or crash report window.

This article covers the following behaviours:

By understanding what happened, and what exactly that ‘crash’ was, we get important clues as to what to do next.

That’s a succinct term, but not very useful when you come to work out what went wrong and how to fix it. When your Mac goes wrong, it’s often called a ‘crash’.

Imac keeps freezing no mouse or keyboard