Shut down your Mac, reconnect a peripheral, and then restart your Mac. Try opening the same apps that were in use at the time of the panic. If everything seems OK, then shut down and connect the next peripheral. Continue the connect-and-test process until all your devices are reconnected. Safe Mode keeps startup items from being loaded, as well as third-party kexts and fonts other than those used by the system. After you disable startup items, use Font Book to validate your installed fonts.
If any fonts come up with errors, use Font Book to disable the indicated fonts. Go ahead and restart normally.
How do you know if it’s a kernel panic?
If no kernel panic occurs, add one of the startup items back, then restart. Repeat and test each startup item until all have been restored. You can use Apple diagnostic routines to test your Mac. You can use the Recovery HD partition to perform the reinstall. Reinstalling the OS should replace any corrupt system files, while retaining user data and apps. For more Rocket Yard guides and tricks, please visit our Tech Tips section. Name required. Email required. Leave this field empty.
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I downloaded and installed macOS High Sierra on my 2nd partition. My 1st partition runs os If everything is OK, the operating system loads the bare minimum number of extensions it needs to run.
Troubleshooting guide to resolve macOS kernel panics
No startup or login items are run, all fonts except those used by the system are disabled, and the dynamic loader cache is dumped. If your Mac starts up in Safe Boot mode, then the basic underlying hardware of the Mac is functioning, as are most system files.
Now try starting your Mac normally. If your Mac restarts without any problems, then a wayward app or driver or some interaction between apps and hardware probably caused the kernel panic. If the kernel panic doesn't recur in a short time, say a day or two of use, you can consider it just a minor inconvenience and get on with using your Mac. When your Mac restarts after a kernel panic, the panic text is added to the log files that your Mac keeps.
Preventing unexpected restarts
Check the CrashReporter folder in Console for any recent log entries. With any luck, it may provide a clue as to what events were taking place immediately before the panic was declared. Isolate your hardware by disconnecting everything but the keyboard and mouse from your Mac. If you're using a third-party keyboard that requires a driver to work, temporarily replace the keyboard with the original Apple-supplied keyboard.
When everything but the keyboard and mouse is disconnected, restart the Mac. If the Mac starts up, repeat the startup process , reconnecting one piece of external hardware at a time and restarting after each until you figure out which device is causing the problem.
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Devices such as wired routers, switches, and printers can all be the source of problems. If you still can't start up your Mac without a kernel panic, it's time to check some basics. Once your Mac boots to the installation or recovery screen , use Disk Utility to run a Repair Disk on all drives connected to your Mac, starting with the startup drive.
If you run into problems with your hard drive that Repair Disk can't fix, it may be time to replace the drive. Of course, other hardware issues can cause a kernel panic beyond the drive. You could have RAM issues or even problems with basic components of your Mac, such as the processor or graphics system.
How to fix a Kernel Panic on Mac
Apple Diagnostics online for Macs introduced after June and Apple's Hardware Test for older Macs can usually find common hardware problems. Disable all startup and login items and then start up again in Safe Boot mode press the power button and immediately hold down the Shift key.
Restart your Mac. Shut down your Mac again and re-connect one device. Repeat this process until you get another kernel panic. You can now either use your Mac without the device or check to see if it has updated drivers and install those, then try again with the device connected.
How to troubleshoot a kernel panic
Software First, rule out a deep-rooted problem with macOS. Restart your Mac in safe mode by holding down the shift key when you restart. This disables login items, kernel extensions, and all fonts not used by the system. If you can reboot in safe mode and use your Mac without a kernel panic occurs, the likely cause of the problem is files installed by an application or a login item.
Try doing a clean install of macOS, and starting from there. Assuming running in safe mode worked, you can reboot normally and use the techniques below to reduce the likelihood of experiencing a kernel panic in the future. Launch iStat Menus from Setapp, and set up monitoring. Use the Dashboard to choose which components you want to display in the menu bar. At the very least, choose CPU. If an app consistently uses a significant percentage of CPU cycles, uninstall it using CleanMyMac see below and reinstall it.
An overheating Mac is likely to run into problems. Uninstall applications with CleanMyMac CleanMyMac allows you to easily uninstall problematic login items and applications. To uninstall an application: