Hi Rob & Stephen, My memory would not be any better than your’s Rob. The only extra details to Rob’s suggestions I would add are: Stephen mentions that the Kernel Panics are happening every startup of the computer. Apple Genius checked the Hardware, so I would assume they also checked the RAM.
So as the Kernel panics are happening at startup indicates a likely problem is a startup / login item, a corrupt font or font conflict, a corrupt system file, or a driver/hardware issue. Checking the log in Console as Rob has mentioned should give you a clue. 1. Launch Console 2. In the Console app sidebar, select the folder named Library/Logs 3. Select the DiagnosticsReporter folder 4. A list of reports will be displayed, select the most recent crash report to view * You can also view the diagnostics report directly by viewing the log file located at: /Library/Logs/DiagnosticsReports * If you view the DiagnosticReport in View -> ‘As List’ then click Date Modified column to sort the folder’s contents by how recently they they were changed. 5. Look through the report for a time corresponding to when the kernel panic occurred. With any luck it will provide a clue as to what events were taking place immediately before the panic was declared. If the logs don’t point to a possible cause, try: 1. Unplug peripherals. If you have anything plugged into your Mac other than a keyboard, mouse or trackball, display, and Ethernet cable, unplug it. Restart, and see if the kernel panic recurs. If not, add the devices back one at a time, restarting after each one: 2. If panics continue with all devices unplugged, try Safe Boot as Rob has mentioned. If the problem goes away, look in the folders inside /Library and ~/ Library for files you’ve added recently. (To make this easier, choose View -> As List and then click the Date Modied column to sort the folder’s contents by how recently they were changed.) In particular, look in /Library/Extensions and /System/Library/ Extensions for any third-party items you remember adding. is may include things like drivers for audio interfaces and input devices, security software, and certain system enhancements. If you find any, look for an uninstaller provided by the developer, and if there is one, use it. If not, consult the documentation that came with the software, or the developer’s website, for removal instructions. (I recommend against manually dragging these items to the Trash unless you can find no other way to remove them.) Restart and see if the problem goes away. If it does, reinstall the apps that use the kernel extensions (or other uninstalled files) one at a time, restarting after each one, until you find the culprit. Ok that’s about everything we can suggest without being able to see the actual computer! We wait to hear the results… Cheers, Ronni 13-inch MacBook Air (April 2014) 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz 8GB 1600MHz LPDDR3 SDRAM 512GB PCIe-based Flash Storage macOS Sierra 10.12.6 > On 2 Oct 2017, at 8:26 pm, Rob Phillips <r.phill...@iinet.net.au> wrote: > > Suggestions, without specifics of what to do - I don't have Ronni's memory > for this. :-} > Time machine should not have re-installed the OS > There may be some corrupt prefs files which were coped back. > Use Console.app to look at the logs of what has been going wrong. Look at the > time things went wrong to see what the problem might be > Boot up in diagnostic mode to do a hardware test - maybe done already > Boot up in Safe mode and see if the machine works OK. This will tell you that > it's a system extension which is causing the problem > Download the OS-specific version of Sierra Cache Cleaner (e.g. Tiger Cache > Cleaner), and clear the caches - follow the instructions - don't just do them > all at once. > Good luck > Rob > > On 2/10/17 3:32 pm, Stephen Chape wrote: >> Hi folks. >> I put this question up about a week ago but missed any replies. >> So just trying again with fingers crossed ! >> >> During the last couple of months on a couple of start ups my son has got a >> black screen with what looks like computer code in white text down the left >> hand side. I think on each occasion he has re-started and it has been OK. >> Looks like a Kernel Panic ? >> >> He has a 27 inch iMac 2012 with the latest OS. >> >> However a few days ago he got this on every start up. >> So he went to the Dubai Apple Shop. >> They ran checks and said the hardware is fine but the issue is with the OS. >> So they reformatted the HD and re-installed the OS for him. >> >> When he got home he used Time Machine to recover his files. >> But he now thinks Time Machine re-installed the corrupt OS. >> Because the issue has returned. >> >> He and I are unsure of the best procedure to follow to correct this issue. >> >> Because he is an Emirates Captain his emails and data are very important to >> his work. >> Although he also has a SuperDuper backup it is too far behind to be a viable >> source for his latest emails. >> >> Any suggestions of best procedure to follow would be gratefully appreciated ? >> >> Regards, >> Stephen Chape
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