kernel panic information for bad ram mac

Since 10.8, as documented in Wikipedia’s excellent potted history of kernel panics in OS X, Macs have behaved differently: they automagically restart themselves, sometimes displaying a kernel panic dialog when next starting up, for “a few seconds”.

After a few seconds, you can press that button more briefly to start it up again. If you ever see this, the only way ahead is to press and hold the power button of your Mac, which will force it to shut down. A traditional kernel panic prior to OS X 10.8. Prior to OS X 10.8, they were usually marked by the display of a special panic screen, shown below. Over various releases of OS X and macOS, Apple has also changed the way in which kernel panics are handled. When a regular user app crashes or ‘unexpectedly quits’, this should never result in a kernel panic, although if the cause is low-enough down in the software it can on occasion. hardware failure, especially memory, storage or logic board.incompatible third-party kernel extensions and other low-level components.serious bugs in macOS, including its kernel extensions and other low-level code.firmware bugs, damaged firmware, particular when waking from sleep and performing other fundamental tasks.

Most recently, they have probably been most common when firmware hasn’t been fully compatible with basic features like waking from sleep.Ĭurrent likely causes of kernel panics include: Since then, different models have been prone to panic with different versions of macOS, and different firmware versions. Defective memory has always been a likely cause, although panics can be the result of a serious disk fault, or any other failing hardware. Panics used to be quite common in early versions of Mac OS X, and had become very infrequent by Yosemite (10.10), unless your Mac had a hardware problem. In a kernel panic, something happens in your Mac which is so injurious to the kernel code running at its heart, that the kernel has to be halted: it then issues a panic.

Kernel panic information for bad ram mac