Q: Reboot fail after installing El Capitan help!!

hello,

i encounter same issue but before searching in Apple community forum I tried to solve it with an Apple care advisor ... Too bad for me.

Following advisors instruction, my fusion drive is now in a weird state and osx installer is not able anymore to write any data on disk and suggest me to contact.... Apple care...

I'm really fed up with Apple and their less and less quality product.

Thanks a lot Lucaspeed!

I had the same issue and your suggestion was perfect for me. The Kext was the Eltima's one.

This time I was lucky but I was wondering if there's a way to read in some log file the output of the single user mode (CMD+S) login screen.

In my case it is so fast to disappear that I was only able to read "Eltima" (and it was enough for me). If it was something different I'm not sure would have been able to figure it out...

Thanks,

Gianpi

I just did the kext fix to my brother's late 2012 MBPRD. The command S did not help but his simptom was slightly different. It would hang in the login screen, sometimes as far as allowing password entry. Some signed karperski kexts were the culprit. In his case, safe boot worked and I was able to work from there. Working from restore mode gave no accurate results.

This link will lead to the final solution to solve the problem: First Boot-Up Into El Capitan "Got Stuck"

If your Mac is randomly getting stuck during the boot process in Yosemite, it may be from unsigned extensions. This is most common with the Mac mini models.

First you will need to get it to boot before we can proceed.

 

Getting the Mac to boot:

1) Start the machine while holding down the Option-Apple-P-R keys

2) Wait until you hear the 3rd startup chime, then release the keys.

3) If that doesn't work try an SMC reset here: https://support.apple.com/en-us/HT201295

 

Now for the fix after you get the machine to boot:

1) Open Terminal in /Applications/Utilities

2) Enter "system_profiler SPExtensionsDataType > ~/Desktop/kextList.txt" without the quotes and hit return(this will take a while to run).

3) There should now be a kextList.txt file on your desktop, open it and press both the "Apple(Command)" and "F" keys to bring up the find.

4) In the find field insert "Obtained from: Not Signed" Copy the destination to the .kext file to a list for use later. (Click next to cycle through all of them.) Example: /System/Library/Extensions/JMicronATA.kext 

5) Browse your drive to /System/Library/Extensions and remove any of the unsigned kext files.

6) Reboot and you should be all set.

Hi Markzol... On October 5th I posted: (please be not offended, but read before posting:-)

Hi everyone!

Think I've got the final solution, found a nifty trick at OWC's website.

The previous poster is almost right, but it is a tailored solution that will not work for everyone, because everyone has different Kext's by different developers and vendors.

It seems to be all about Kexts and they are in TWO locations, /Library/Extensions AND /System/Library/Extensions.

If you cannot boot, as was the case with me, start a recovery, either via internet or a thumb drive.

It will not destroy everything so no clean install necessary.

After startup do the following (I did everything with Finder):

From OWC and edited by me:

1) Open Terminal in /Applications/Utilities

2) Enter "system_profiler SPExtensionsDataType > ~/Desktop/kextList.txt" without the quotes and hit return (this will take a short while to run).

3) There should now be a kextList.txt file on your desktop, open it and press both the "Command" and "F" keys to bring up the find.

4) In the find field insert "Not Signed" Copy the destination to the .kext file to a list for use later. (Click next to cycle through all of them.) Example: /System/Library/Extensions/JMicronATA.kext 

5) Browse your drive to /System/Library/Extensions and create a folder by the name Unsupported, move any of the unsigned kext files to the folder Unsupported. Delete the Kexts from their original location.

6) Browse in /Library/Extensions and create again a folder named Unsupported. Look if there are more unsupported Kext's and move them to the folder Unsupported. Delete the Kexts from their original location.

7) Beware that there may be Kext's that are "not signed" that you want to keep because you may need them for programs known and trusted by you, so do not move them to the unsupported folder(s). If you did, no worries, you can always put them back later if there are troubles.

8) Reboot and you should be all set.

This did the trick for me, hopefully for everyone...?

Yes you right you have explained before but you didn't make any resume to all the steps in single sheet, so I believe this will prevent users to read all steps and wasting time ... so this should be marked as "THIS HELPED ME"

Best

Mark

Anyway folks...

I hope that this stupid startup-thing is solved by now.

Most people affected seems to have the Etima (e.g. Syncmate, now out of date) syncing-software for Windows and RIM(Blackberry) devices that is causing this startup trouble.

I believe that I, and many other users with me, did never do a clean install, because it seemed totally unnecessary, why, for what reason...?

My Mac was and is still working great after updates from Lion to ElCap, and I never saw the reason for clean installs, to much work, and, I'm very lazy:-)

But old things can cause troubles. So, expect weird things to happen when updating to a new OS, old kexts, old software, old whatever things can and will cause headaches...

Thanks for this board and many thanks to the guru's (OWC and again a guy called Max108 on the developers forum) that put us in the right direction.

To a member, Fred from Doornspijk: I read your postings, but they seem to be deleted or modified. Hope you are OK by now, otherwise let us know? WeI'll be glad to help if we can!

Cheers, Gerard...!

Thank you. It worked on my iMac, also. I deleted the Eltima extension after booting from an external system disk. I used the Finder instead of the Terminal. The reboot worked fine ever since. Two thumbs up!

Thanks Gerard from NL for the 'invitation'. If I read the postings and see all the expertise I feel very stupid. The - obviously - most simple Apple things I don't know. I have learned that can you start the MacBook in safe mode by pressing the shift key and holding it till the computer is working. So I can wait till Apple comes with an update for El Capitan of try - when I am back at home - to set a back up from a month ago on my computer. But I can also give it a try.

So I have the computer the safe mode. I have found Terminal, but when I click on terminal to open it, it does not open.

In your answer to Markzol you write: "start a recovery, either via internet or a thumb drive". How do I start a recovery via internet?

Hello Fred from Doornspijk, to do a Recovery: Start up while holding Command and R simultaneously.

(described by Apple in this link: https://support.apple.com/en-us/HT201314)

After giving your credentials to the Apple app store It will download the installer, about 6Gb so it will take some time. After that, it will install and it will reboot your Mac. It will not erase your data nor do a clean install so everything should be fine and as it was.

Your Mac should at that point be working normal.

But: Do not restart again as it will be hanging again on the progress bar if you have faulty Kexts in /lLibrary/Extensions and/or /System/Library/Extensions.

The way to fix it I described in earlier postings, best to print the instructions first before you start looking for them. Also, note that Terminal commands are Case Sensitive.

Suspects are Etima (Syncmate), JMicronATA, old Parallel software and so.

You can, as I did, do everything also with Finder. If you do: Make sure that in the Finder preferences -> sidebar -> show Hard disks is marked and by advanced -> show all filename extensions is marked, so you can see the Kexts extensions and it is easier to find the /lLibrary/Extensions and /System/Library/Extensions mentioned earlier…

If you move Kexts to an other directory (e.g. Unsupported) make sure that you delete the Kexts from their original location. (It will ask for your password if you do.)

Good idea is to make a bootable USB stick with the ElCapitan installer. This will make future problems a lot simpler to solve.

Easy way to do it is using a great little free app you find at diskmakerx.com Note: it will look for the ElCapitan installer in your applications folder. If it is deleted (this happens almost always after installing) you must download ElCapitan again from the app store. Creating the USB stick does take a while, so go for a walk:-)

Hope this explained it a bit, let me know!

Hi GSfromNL.

I have a problem.

If I run the command system_profiler SPExtensionsDataType > ~/Desktop/kextList.txt using an external operating system installed in an external hard drive, generates me the list of extensions of THE external hard drive, not the internal Volume. How can I get the  correct list?

Thank you very much!

As far as I know: The system_profiler command is the system you are working on, so it gives you a list from your system started with the external startup disk.

I'm not a Terminal expert but trying the following commands in Terminal should work to list the kexts on your internal drive.

Start Terminal and type: cd /Volumes/HDname  (--->Replace HDname with the name of your harddisk. If there is a space in the name put in a backslash and space like HDname\ XX)

Then type or copy/paste:

sudo ls -1 /Library/Extensions/ ; sudo find /System/Library/Extensions -ctime +1d -depth 2 ; sudo find /Library/Extensions -ctime +1d -depth 2

This I believe, will give you all the kexts for you to sort out…

The easier way is to boot from the internal HD, more reliable…

Thx GSfromNL,

Did the trick for me also, MAC MINI LATE 2012, 8Gb RAM, 256 SSD

Working like a charm with your solution (not working with the previous ones) Thank you GSfromNL!

Dear GSfromNL. After starting with command + R I get the "OS X-helprograms" with four choices: 1. set back from Time Machine  2. Install OS X again  3. Look for help information online  4. Disk help program.

A couple of days ago I chose for option 2. El Capitan is downloaded again, installed again and then my computer is switched off automatically. Is option 2 what you mean with 'Recovery'?

Thanks Fred