El Capitan won't Boot after update

Hi, I had the same issue several times after installations of third party software too.

I resolved it booting into recovery and "touching" the system's extensions folder. This will make the Mac rebuild extensions cache.

What I did:

1) Power off the Mac

2) Press Option key and Startup

3) Keep Option Key pressed until the boot volumes show up on screen

4) Select the "Recovery 10.11" and press Return

5) From the "Utility" menu open "Terminal"

6) Touch Extensions. issue the following command. Replace Macintosh\ HD for the name of your system hard drive. Spaces are written as "\ "

touch /Volumes/Macintosh\ HD/System/Library/Extensions

7) Quit Terminal; Quit Mac Utilities

8) Re-select your system hard drive on the "Choose Startup Disk" dialogue.

9) Restart

Note: the touch utility just updates the modification date of the file/folder. It does not change any content, therefore, this method should be safe.

Nevertheless, don't blame me for lost data or something bad.

Cheers,

Carlos

Remove the EltimaAsync.kext using terminal.

That will get you started back up.

Can't find that file on /Extensions, even used command: find / -name EltimaAsync.kext without any results

Tried every step you mentioned, still having the same problem,

What a load of bollocks! - I had the same this morning - panicked - re-started close to 50 times but no luck.

I'm on late 2011 iMac 27" with wireless keyboard and pad + mouse.

What worked for me was to re-install El Capitan using CMD + R - now I'm afraid to turn off the darn thing - will keep it on "sleep" until they release a fix for this.

Dear fjulian,

Sorry to hear it didn't work.

When quitting OSX Utilities make sure to go into Startup Disk selection and re-select your drive. Simple restart didn't work for me.

You can "touch" the /System/Library/Caches folder and see if it makes a difference.

While you're in the recovery mode, you can also try to check/repair your system drive with Disk Utilities, as others have suggested.

There are a lot of discussions with similar issues on the web. This behaviour seems to be related with the rootless operation of El Capitan. It increases safety but may turn your system incompatible with older software and system extensions.

Regards,

Its work!:

Posted by TSOPA from Reboot fail after installing El Capitan help!!

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(!) HardDisk-name.

• cd "/Volumes/Macintosh HD/Library/Extensions/" ; mkdir Unsupported ; mv Net* Unsupported ; mv Sym* Unsupported ; mv hp* Unsupported ; mv ndc* Unsupported ; cd "/Volumes/Macintosh 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/Macintosh HD/Library/Filesystems/*fuse* ; rm -Rf /Volumes/Macintosh\ HD/Library/Application\ Support/Sym* ; rm -Rf /Volumes/Macintosh\ 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. Be patient, restart does not begin immediately, and in 20-30 seconds

Russ...thanks for taking the time with this...BUT,

Do you work for Microsoft or Google?

Carlos, I have no idea what is "touch", and, to be honest, after fighting with this issue for all afternoon, I don´t want to know. But I did exactly what you said, changing "Macintosh\ HD" for "Samsung\ SSD", my hard drive name, and it worked nicely.

All my data is there, with no harm.

Thank you very much

Mine as well. My Macbook Pro is now an expensive paperweight now this! Lucky I still have my trusty windows desktop lol

My iMac started acting up one day after installing El Capitan (no idea if there is any connection there). I tried a restart and got just a grey screen, no start-up sound, no logo, no nothin'. I waited a minute and tried shutting off with the power button, waiting 30 seconds, and then turning on with the power button. Tried this three times but always got only the grey screen.

After reading several threads in Support, I followed a procedure suggested by several persons - I unplugged all USBs, shut off my iPhone, and went through the power button routine again. Hallelujah! My iMac booted properly. I then replugged the USBs, and everything now seems to be working fine.

I have no clue whether the cure was unplugging the USBs, shutting off the iPhone, or a combination - but it WORKED.

I have exactly the same situation.

Everything works great after upgrading to El Capitan but if I switch off it won´t turn back on unless I reinstall the OS X El Capitan. Data is all secure and works fine again....and then all over again if I swich off. Of course I cannot leave the Mac forever switch on and the whole process takes a while after every try so, does anyone have a solution to this issue? Thanks in advance for your help.

I tried Cmd+R and reinstall OS X El Capitan, but the same happens all over again, and again, ...and again. I don´t dare to switch off since I know as a fact that I will have to reinstall the OS X again.

same here :-(

I see written:

"/Macintosh HD/ "

and also:

"/Macintosh\ HD/"

So, can you tell me what is the name I ought to be replacing? THANKS in advanced !!!