First Boot-Up Into El Capitan "Got Stuck"

Hi, I know this is an old post but wanted to say cheers.

Got a question though..

I followed these instructions after El Capitan update and a white screen issue:

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.

I got to the point of creating the kextlist.txt file but it wouldn't find anything when searching Obtained From: Not Signed.

I did get a random message that popped up on my desktop about a certain kext.txt file not being found but I haven't found or deleted anything as I said. Is this a problem? Can I just forget about it all now?

I think my issue may have been an old soundcard that was connected but thats 's longer supported in El Capitan.

I have another problem though, my MAC won't shut down unless I use the power button. When I click shutdown Finder disappears but the dock is still available and nothing happens?

Thanks

Thanks for the above. I had made my own post about this earlier and after 48 hours of headaches trying to resolve this issue, this done the trick.

excatly what i needed ... truely appricate your help with this

This worked for me, many thanks too.

I'm having big time trouble booting my macbook pro early 2011 after upgrade to ElCap from Yosemite!

I'm trying to apply your solution, but my biggest problem is not being able to boot using Option-Apple-P-R keys

Please advise!

Mine is MacBook Pro 15-inch, Early 2011, and I have Mac 2011 Office upgraded to 14.5.7, and other applications including Safari browser (I have no other browser) upgraded by clicking the installed applications and checking their websites one by one. I checked to ensure no more Apple Store upgrade.

I also have FireVault off.

But after installed El Capitan, at the first boot up after first power shut down, I still got the same problem of grey screen with no progress in progress bar.

Apple Store could not solve the problem except asked me either to clean install or to wait for El Capitan patches or other applications upgrade gradually.

Thanks for the insight from Cerebra and others, I tried all methods mentioned except removing some kexts as there are 38 kexts not signed (most belonged to HP printer and a Huawei driver (?). I do not know what are these so I did not try to remove any.

I tried to boot up in Startup Manager (Option + Power on) but after I selected my only hard disk, it did not work to boot into El Capitan.

Today I tried again to boot up in Command R to look for any more clues.

After closing language, in the next screen, I clicked the top left Apple logo to bring up Startup Disk.

In the screen shown, I selected my only hard disk shown once, then I clicked the top left menu to Quit Startup Disk.

It took a short while before the top menu changed to show Language Chooser.

I clicked Shut Down instead.

After a few minutes, I boot up the Macbook normally and it could log into El Capitan and now everything is smooth.

As there is no file to remove or no tweaks or terminal command to make, see if you can get your luck this way.

@carlosip

It got it to work, all thanks to the posts with details on how to remove the kexts files. I had the not-signed Huawei and HP ones too. After removing them, plus all the suspicious ones, everything worked just fine.

Yet, while in the safe mode, I was able to use command line on files only in "read-only", though there were two commands on how to gain access in "read-write". I used the commands and did all the backup for the culprits. Now, I'm a happy camper.

Thank you, everyone who took the time and effort to write down detailed answers to such big deal. You saved the day for me!

Thank you for posting - this worked for me and allowed me to install El Capitan and reboot. Cheers.

Deleting the unsigned .ktext files worked.

Awesome! It worked well for me. I just followed the above steps and deleted all the unsigned .kext files. Now, i'm able to reboot. Although, the Apple tech team was not aware of this issue when i called up their customer care. Not to mention they never suggested me to do a SMC reset. SAD!

None of this worked for me. I did the SMC reset and no matter what happens, my macbook is still stuck on the white screen with the progress bar about 90% completed. It's been like this for 4 days straight day and night. I've powered off and on a few times, but nothing changes. It is making extremely weird noises now...

What do I do?

Having the same problem. Left the screen white on over night but it did not change. Shut down with button, unplugged, rebooted PRAM and the Apple logo appeared. Left it and then saw message "Installing.. 12 minutes left". Finished but restarted, then screen went grey and now is black. I hour later still black but I can hear the disk still working. Wait.... Wow!! Screen back on seems to be finishing. Now "completing: about 11 minutes remaining" (Gosh this is slow!) Completed, keyboard re plugged in but Mac wont see it 'cos I forgot to plug it back in! Shut down with button, unplugged, rebooted, had chime but nothing more. Having lunch (more exciting) and so far the Apple logo has NOT appeared. Disk drive working (can just hear it). Waited till well after lunch. Nada. Trying SMC restart. I.E. Unplug. Wait at least 15 secs. Reconnect. Wait 5 secs. Go. Chime. Logo. Bar at 80%. Screensaver for ElCapitan up. Looks good now. Will check for these kext lists but I'd have thought Apple would make the computer check for such things BEFORE allowing an upgrade. Back to work now.

Thanks that did the trick.

Thank you!

My machine gets the grey screen and a progress line, and slowly boots showing the progress. It does this every single time that I boot the Mac Book Pro. Will it continue to do this? How can I get it to do a quick boot like it did with the original software?