Reboot fail after installing El Capitan help!!

I have the same problem and have restored twice with the same problem. I did run across this solution, but am to tired to try it right now. I do not plan to shutdown again until I can get it fixed on my other mac computer. Having the same problem on both. Keep you posted.

https://forums.developer.apple.com/thread/21331

Either way, this is best fixed from Recovery Mode, but you shouldn't have to reinstall again to boot normally because moving the kexts in Recovery Mode should allow the boot process to continue as normal. Let me know how it goes.

1. So Boot into Recover Mode.
2. From the central menu open Disk Utility.
3. Then select the "Macintosh HD" partition, then the "Unlock" from the "File" menu (Skip this step if you can't see "unlock")
4. Select the Get Help Online link from the meunbar to open Safari.
5. Navigate back to this thread.
6. Select all of the writing in bold below and press cmd+C to copy it to the clipboard:

   cd "/Volumes/Macintosh HD/Library/Extensions/" ; mkdir Unsupported ; mv hp* Unsupported ; mv B* Unsupported ; cd "/Volumes/Macintosh HD/System/Library/Extensions/" ; mkdir Unsupported ; mv Elt* Unsupported ; mv ssud* Unsupported ; rm -Rf /Volumes/Macintosh\ HD/Library/Application\ Support/Rox* ; rm -Rf /Volumes/Macintosh\ HD/Library/Application\ Support/Check* ; rm -Rf /Volumes/Macintosh\ HD/Library/Filesystems/*fuse* ; rm -Rf /Volumes/Macintosh\ HD/var/folders/*

7. Then go to the Utilities menu, open Terminal and press cmd+V to paste the long command into it.
8. Restart normally a couple of times to confirm

For everyone: faulty KEXTS...

I found yesterday evening the same in the developers forum mentioned by Tsofa.

Did not have the time to post or the time to check my Kext's. Will do today and make a bootable USB as well.

But:

Do not use the line mentioned in post following point 6 from Tsofa!

This solution was tailored for a specific user by a Mac-Guru called Max108 (Thanks!) and therefore not suitable for every user.

First look at the Kext's that Terminal will display, copy and paste it in a text editor.

Then look very careful what Kext's you do'nt use or are suspected.

Also: in the line after 6 it says:

cd "/Volumes/Macintosh HD/Library/Extensions/" (and so on...)

Do not put in both quotes and replace the name Macintosh HD with the name of your harddisk or SSD.

More info at:

https://forums.developer.apple.com/message/67206#67206

Will keep posting...

Start your Mac keeping CMD+S pressed until you see white text on a black background then release them.

At some point (very soon after boot) your Mac will hang telling you (I'm sorry, you'll have to read it yourself) that something crashed, showing you a backtrace of the problem.

You'll see something like com.somevendor.somesoftware is in the backtrace.

That identifier can help to find what software is causing the problem.

Once you have the kext name you can boot in Recovery, start Terminal and do a

# cd /Volumes/YourHDName/System/Library/Extensions/

# rm -r FaultyKext.kext

# cd ../Caches

# rm com.apple.kext.caches

# nvram -d boot-args

The last step is to clear the nvram.

This steps are to remove a faulty kext only, please don't use them if your problem is not kext related.

I'm sorry I cannot help more than this, mainly because (1) English is not my native language and (2) I can't replicate the issue right now

I had the same problem. El Capitan installed OK, but when I did a reboot, I just got the white screen with the Apple logo, and a progress bar that progressed about 2/3 of the way. After an hour of nothing happening, I shut down my iMac completely. Here is what I did and it worked:

1. Shut your Mac down completely with the power button .

2. Press and hold down the Option key - don't let it go, just keep holding it down.

3. Press your power on button to start up your Mac.

4. In a short while you will see two hard drives. The one on the left is silver in color, and the one on the right is Orange/Yellow which is your recovery drive.

5. Click your mouse only on the silver hard drive icon.

6. It should immediately boot your Mac into El Capitan.

7. If you just turn on with the power button, without holding down the Option key, it will just sit there and nothing will happen as I said in my first paragraph.

I hope it works for you, and I hope Apple fixes this problem soon so it will boot up normally.

Good Luck 🙂

Similar story here,

updated then it restarted the system and my login screen came up (apple encrypted HDD). So far all smooth but after I enter the password the system crashes and starts again. I reset PRAM / SMC no change, and I couldnt even boot in the safe mode. Hardware test result was fine no issues at all. Lucky I could recover from a time machine backup though I still lost my parallels system now forever.... Thanks Apple great Job on this update.... Steve would have fired the whole lot of you on the spot.

Hey I ran across this fix and it worked for me on two machines.

Email this code to yourself, but change the machine name to YOUR EXACT machine name.

• cd "/Volumes/MacMini HD/Library/Extensions/" ; mkdir Unsupported ; mv Net* Unsupported ; mv Sym* Unsupported ; mv hp* Unsupported ; mv ndc* Unsupported ; cd "/Volumes/MacMini HD/System/Library/Extensions/" ; mkdir Unsupported ; mv Belc* Unsupported ; mv Eltima* Unsupported ; mv hp* Unsupported ; mv Hua* Unsupported ; mv Netg* Unsupported ; mv Remo* Unsupported ; mv RIM* Unsupported ; mv USBEx* Unsupported ; rm -Rf /Volumes/MacMini\ HD/Library/Filesystems/*fuse* ; rm -Rf /Volumes/MacMini\ HD/Library/Application\ Support/Sym* ; rm -Rf /Volumes/MacMini\ HD/var/folders/*

Boot in Restore mode.

Click OS help and Safari will open

Open your email and copy the code

Quit Safari and open Terminal from the top menu

Paste the code and hit return.

Give it a minute or two. When it is done you will then be able to quit Terminal.

Restart

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.

Hi GSfromNL,

I reinstalled El Capital 3 times, reset pram, reboot and use the disk utilities to repair disk (o permission repair anymore in El Capitan), try safe boot (not working) and finally your solution, because the first reboot fail after installing.

But when I go to step 4 "Not Signed" nothing happened, no list. So it seems not to be the solution ?

Suppose you have the TXT file open in Texteditor? Press command and F and there is a search field on top. If you put in Not Signed you must see the 'not signed kexts'. Unless there are no unsigned kexts... Maybe you can post the txt file, I will have a look...

Nothing appears so I guess I do not have any unsigned kexts

This works Pedro.

Hey I ran across this fix and it worked for me on two machines.

Email this code to yourself, but change the machine name to YOUR EXACT machine name. The MacMini HD is the name of one of my macs. Make sure that you replace it with you exact hard drive name. Do not us HD if your hard drive does not have that in its name. Replace it everywhere in the text.

• cd "/Volumes/MacMini HD/Library/Extensions/" ; mkdir Unsupported ; mv Net* Unsupported ; mv Sym* Unsupported ; mv hp* Unsupported ; mv ndc* Unsupported ; cd "/Volumes/MacMini HD/System/Library/Extensions/" ; mkdir Unsupported ; mv Belc* Unsupported ; mv Eltima* Unsupported ; mv hp* Unsupported ; mv Hua* Unsupported ; mv Netg* Unsupported ; mv Remo* Unsupported ; mv RIM* Unsupported ; mv USBEx* Unsupported ; rm -Rf /Volumes/MacMini\ HD/Library/Filesystems/*fuse* ; rm -Rf /Volumes/MacMini\ HD/Library/Application\ Support/Sym* ; rm -Rf /Volumes/MacMini\ HD/var/folders/*

Boot in Restore mode.

Click OS help and Safari will open

Open your email in iCloud or where ever you access your email on the internet and copy the code

Quit Safari and open Terminal from the top drop down menus

Paste the code (command v) and hit return.

Give it a minute or two. When it is done you will then be able to quit Terminal.

Restart

You can also try holding down the option key at startup. Hold down before pressing the startup button and keep it down. Screen should come up with two hard drives. Select your hard drive and click start or continue. If the hard drives do not come up then try the above suggesting using the code.

Hope this helps.

Hello Tsofa, Your way of doing it will work, but... Not everyone has the same Kexts. For instance, the Etima kext comes from the app SyncMate, now obsolete. But not everyone has SyncMate ever installed. I did, with an old windows organizer, so Etima was in my Kexts as well. You apparently had something from Netgear and Blackberry (RIM), so these are the Kexts you have from those developers.

Everyone has his or hers Kexts, not necessarily Netgear or Blackberry, so you cannot use your, 'tailored' for your macs, script for everybody else's Mac.

The only way to sort them out is looking in /Library/Extensions AND /System/Library/Extensions and carefully move the suspects to a different folder (e.g. Unsupported) and delete them from their original location.

Thanks GSfromNL

I will delete the post.