Error load kernel cache

Prohibited sign at start up: error loading kernel cache (0x7)

I’d really appreciate some help.

I have a 2009 27″ iMac running Yosemite and it recently decided to experience the prohibited sign on startup.

I cant start it in safe mode, and in verbose it gives error loading kernel cache (0x7) then starts in recovery mode.

I’ve saved my files via target disk and tried repairing the disk and permissions with no luck.

I did a reinstall from online and it booted fine, but the next time I restarted it’s gone back the the prohibited sign?

Thanks in advance!!

iMac, OS X Yosemite (10.10.3)

Posted on May 17, 2015 2:26 PM

«Avast» is the worst of the whole wretched lot of commercial «security» products for the Mac. Not only does it fail to protect you from any real danger, it may send personal data (such as web browsing history and the contents of email messages) back to the developer without your knowledge, give false warnings, destabilize and slow down the computer, expose you to network attack, and corrupt the network settings and the permissions of files in your home folder. Removing it may not repair all the damage.

Some versions of the product also inject advertising into web pages. In short, apart from the fine print in the license agreement, Avast is indistinguishable from malware, and is arguably worse than any known malware now in circulation.

Back up all data, then remove Avast according to the developer’s instructions. Restart.

If you tried to remove Avast by dragging an application to the Trash, you’ll have to reinstall it and then follow the instructions linked above.

Posted on May 18, 2015 5:27 AM

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Your hard drive may be failing.

Thanks for the reply, is there anything I can do to confirm that with replacing it?

Boot from your OS X installer DVD. Open Disk Utility and try repairing the HDD (do not Verify. Repair.) If you are able to repair the drive successfully then try reinstalling Yosemite .

Reinstalling OS X Without Erasing the Drive

Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.

Reinstalling OS X Without Erasing the Drive

Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.

When the recovery menu appears select Disk Utility and press the Continue button. After Disk Utility loads select the Macintosh HD entry from the the left side list. Click on the First Aid tab, then click on the Repair Disk button. If Disk Utility reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit Disk Utility and return to the main menu.

Reinstall OS X: Select Reinstall OS X and click on the Continue button.

Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

Reinstall OS X Without Erasing the Drive

Choose the version you have installed now:

Note: You will need an active Internet connection. I suggest using Ethernet

if possible because it is three times faster than wireless.

1. This procedure is a diagnostic test. It changes nothing, for better or worse, and therefore will not, in itself, solve the problem. But with the aid of the test results, the solution may take a few minutes, instead of hours or days.

The test works on OS X 10.7 («Lion») and later. I don’t recommend running it on older versions of OS X. It will do no harm, but it won’t do much good either.

Don’t be put off by the complexity of these instructions. The process is much less complicated than the description. You do harder tasks with the computer all the time.

2. If you don’t already have a current backup, back up all data before doing anything else. The backup is necessary on general principle, not because of anything in the test procedure. Backup is always a must, and when you’re having any kind of trouble with the computer, you may be at higher than usual risk of losing data, whether you follow these instructions or not.

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There are ways to back up a computer that isn’t fully functional. Ask if you need guidance.

3. Below are instructions to run a UNIX shell script, a type of program. As I wrote above, it changes nothing. It doesn’t send or receive any data on the network. All it does is to generate a human-readable report on the state of the computer. That report goes nowhere unless you choose to share it. If you prefer, you can act on it yourself without disclosing the contents to me or anyone else.

You should be wondering whether you can believe me, and whether it’s safe to run a program at the behest of a stranger. In general, no, it’s not safe and I don’t encourage it.

In this case, however, there are a couple of ways for you to decide whether the program is safe without having to trust me. First, you can read it. Unlike an application that you download and click to run, it’s transparent, so anyone with the necessary skill can verify what it does.

You may not be able to understand the script yourself. But variations of it have been posted on this website thousands of times over a period of years. The site is hosted by Apple, which does not allow it to be used to distribute harmful software. Any one of the millions of registered users could have read the script and raised the alarm if it was harmful. Then I would not be here now and you would not be reading this message. See, for example, this discussion.

Another indication that the test is safe can be found in this thread, and this one, for example, where the comment in which I suggested it was recommended by one of the Apple Community Specialists, as explained here.

Nevertheless, if you can’t satisfy yourself that these instructions are safe, don’t follow them. Ask for other options.

4. Here’s a general summary of what you need to do, if you choose to proceed:

☞ Copy a particular line of text to the Clipboard.

☞ Paste into the window of another application.

☞ Wait for the test to run. It usually takes a few minutes.

☞ Paste the results, which will have been copied automatically, back into a reply on this page.

These are not specific instructions ; just an overview. The details are in parts 7 and 8 of this comment. The sequence is: copy, paste, wait, paste again . You don’t need to copy a second time.

5. Try to test under conditions that reproduce the problem, as far as possible. For example, if the computer is sometimes, but not always, slow, run the test during a slowdown.

You may have started up in safe mode. If the system is now in safe mode and works well enough in normal mode to run the test, restart as usual. If you can only test in safe mode, do that.

6. If you have more than one user, and the one affected by the problem is not an administrator, then please run the test twice: once while logged in as the affected user, and once as an administrator. The results may be different. The user that is created automatically on a new computer when you start it for the first time is an administrator. If you can’t log in as an administrator, test as the affected user. Most personal Macs have only one user, and in that case this section doesn’t apply. Don’t log in as root.

7. Load this linked web page (on the website «Pastebin.») The title of the page is «Diagnostic Test.» Below the title is a text box headed by three small icons. The one on the right represents a clipboard. Click that icon to select the text, then copy it to the Clipboard on your computer by pressing the key combination command-C .

If the text doesn’t highlight when you click the icon, select it by triple-clicking anywhere inside the box. Don’t select the whole page, just the text in the box.

8. Launch the built-in Terminal application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U . The application is in the folder that opens.

☞ Open LaunchPad and start typing the name.

Click anywhere in the Terminal window to activate it. Paste from the Clipboard into the window by pressing command-V , then press return . The text you pasted should vanish immediately.

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9. If you see an error message in the Terminal window such as «Syntax error» or «Event not found,» enter

and press return . Then paste the script again.

10. If you’re logged in as an administrator, you’ll be prompted for your login password. Nothing will be displayed when you type it. You will not see the usual dots in place of typed characters. Make sure caps lock is off. Type carefully and then press return . You may get a one-time warning to be careful. If you make three failed attempts to enter the password, the test will run anyway, but it will produce less information. If you don’t know the password, or if you prefer not to enter it, just press return three times at the password prompt. Again, the script will still run.

If you’re not logged in as an administrator, you won’t be prompted for a password. The test will still run. It just won’t do anything that requires administrator privileges.

11. The test may take a few minutes to run, depending on how many files you have and the speed of the computer. A computer that’s abnormally slow may take longer to run the test. While it’s running, a series of lines will appear in the Terminal window like this:

Part 1 of 8 done at … sec

Part 8 of 8 done at … sec

The test results are on the Clipboard.

Please close this window.

The intervals between parts won’t be exactly equal, but they give a rough indication of progress. The total number of parts may be different from what’s shown here.

Wait for the final message «Process completed» to appear. If you don’t see it within about ten minutes, the test probably won’t complete in a reasonable time. In that case, press the key combination control-C or command-period to stop it and go to the next step. You’ll have incomplete results, but still something.

12. When the test is complete, or if you stopped it because it was taking too long, quit Terminal. The results will have been copied to the Clipboard automatically. They are not shown in the Terminal window . Please don’t copy anything from there. All you have to do is start a reply to this comment and then paste by pressing command-V again.

At the top of the results, there will be a line that begins with the words «Start time.» If you don’t see that, but instead see a mass of gibberish, you didn’t wait for the «Process completed» message to appear in the Terminal window. Please wait for it and try again.

If any private information, such as your name or email address, appears in the results, anonymize it before posting. Usually that won’t be necessary.

13. When you post the results, you might see an error message on the web page: «You have included content in your post that is not permitted,» or «The message contains invalid characters.» That’s a bug in the forum software. Please post the test results on Pastebin, then post a link here to the page you created.

14. This is a public forum, and others may give you advice based on the results of the test. They speak for themselves, not for me. The test itself is harmless, but whatever else you’re told to do may not be. For others who choose to run it, I don’t recommend that you post the test results on this website unless I asked you to.

Copyright © 2014, 2015 by Linc Davis. As the sole author of this work (including the referenced «Diagnostic Test»), I reserve all rights to it except as provided in the Use Agreement for the Apple Support Communities website («ASC»). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.


Error loading kernel cache (0x6) problem

Im experiencing some trouble with my macbook pro 2012.

It all started with the computer shutting down and when started again I get the white screen, apple symbol kind of glitching and showing a circle with a line drawn in it. I turn it of, and then later it works again. This problem occurs a few days later and I start to research the problem.

I remove my hard drive and access it via an external adapter to transfer my files. I erase the hard drive (a samsung SSD 840, 256gb) and re install OS. When the computer restarts I get white screen, apple symbol, the circle with a line in it and a folder with a question mark.

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I reboot pressing cmd + v and get the following message which keeps on loading on the screen. It was very hard for me to make out what it said, but I managed to take a picture of it and typed it down for you to see below.

EDIT: I´ve already tried to reset PRAM, used the Disk Utility to repair/verify and it says it is okay. I´ve been running Yosemite without any problems what so ever. I´ve exchanged the RAM and HDD a long time ago so no issues there.

Im not really sure what caused this, and are eager to get my macbook working again. Does anyone have a solution to this problem? I tried erasing the hard drive again and re installing OS but it did not work :/

Error loading kernelcache (0x6)

efiboot loaded from device: Acpi (PNP0A03,0)/Pci(1Fl2)SATA(0,0)/HD(Part2,SigF8DD)

boot file path: /OS X Install Data/boot.efi

.Loading kernel cache file ‘/OS X Install Data/kernelcache’.


Error load kernel cache

    UEFI bios:
  • Скидываем все настройки в default.
  • AHCI — enable;
  • Vt-d: Disable (+ в Clover дропнуть DMAR таблицу)
  • Vt-x: Enable (только для 10.13 и если используете виртуальные машины)
  • Intel Virtualization Technology — Enable
  • Serial-port: Disable (Можно оставить включеным, но это требует внесения изменений в загрузчик (Opencore)
  • XHCI Hand-off: Enabled (рекомендуеться)
  • XHCI Hand-off: Disable (только если что то не работает в режиме Enable )
  • IOAPIC 24-119 Entries: Enabled (подмечено что у многих с этим пунктом паникует, поэтому тестируйте)
  • CSM: Disable (если ваша видеокарта не умеет работать в режиме UEFI — не выключайте)
  • Fasboot: Disable
  • Secure boot: Disable or Other OS
  • ResizeGPUBars: Disable (Можно оставить включеным, но это требует внесения изменений в загрузчик (Opencore)
  • Above 4g decoding: Enable

Legacy bios:

  • AHCI: enable;
  • HPET: enable;
  • Vt-d: disable;
  • ACPI Suspend Type — S3 (Only);
  • No Execute memory — enable;
  • USB Legacy — enable;
  • Отключаем всю периферию (вебки, смарты, блютуз-свистки, кард-ридеры и т.д.)
  • Для установки потребуется флешка не менее 16Гб.

    • ПК на ОС Windows XP/7/8/10/11
    • Скачать утилиту Boot Disk Utility с страницы разработчика cvad или с форума со страницы посвящённой данной утилите.
    • Установить по инструкции
    • Добавить в EFI\CLOVER\Kext\Other
    • Добавить в EFI\CLOVER\Kext\Other…WhateverGreen/releases
    • Скачать образ Mac OS X по указанным ссылкам:
      Нажми и качай!
    • Развернуть скаченный образ на подготовленную флешку.
      1. Инструкция с пункт «Заливка дистрибутива macOS на второй том загрузочного USB Flash drive:«:
      2. Перед распаковкой образа необходимо нажать кнопку ^Format disk^.
      3. В основном окне программы -> Destination Disk — выбираем наш USB Flash Drive -> Part2.
      4. Нажимаем кнопку «Restore Partition».
      5. В открывшемся окне проводника выбираем распакованный файл с расширением *.hfs.
    • Тем, кто устанавливает на ноутбук (или имеет PS/2 мышь или клавиатуру) , обязательно скачать ( 97.46 КБ )
      , новая версия: ( 93.86 КБ )
      положить в папку EFI/CLOVER/KEXT/10.X или Other
    • Всё, установочная флешка готова, можно приступать к установке.

    За данный споcоб установки благодарим cvad и Skvo
    Данная инструкция написана по материалам с

    • OPT — показать меню загрузки OpenCore. Также поддерживается клавиша Esc.
    • CMD+OPT+P+R — очистить NVRAM. Требуется Misc-Security-AllowNvramReset=YES.
    • X — загрузить первую найденную операционную систему Apple, если по умолчанию выбрана не операционная система Apple.
    • CMD+R — загрузка в режиме восстановления (Recovery).
    • CMD+C+MINUS — отключить проверку совместимости на board-id.
    • CMD+K — загрузка актуального ядра, аналогично kcsuffix=release.
    • CMD+S+MINUS — отключить KASLR slide, требуется выключенный SIP.
    • CMD+S — однопользовательский режим, налогично флагу -s в аргументах загрузки.
    • CMD+V — логирование загрузки, аналогично флагу -v в аргументах загрузки.
    • Shift — безопасный режим, налогично флагу -x в аргументах загрузки.
    В зависимости от железа, при загрузке может не все работать или работать не надежно. На PS/2 при загрузке доступно только Esc.

    Комбинации клавиш в меню, после входа в него по OPT(Esc) или при ShowPicker=YES
    За счет того что в меню действует параметр Misc-Boot-PollAppleHotKeys=YES успехов тут обычно больше. Не включайте, если с выключенным работает.

    • Esc — отмена тайм-аута.
    • CMD+OPT+P+R — очистить NVRAM. Требуется Misc-Security-AllowNvramReset=YES.
    • CMD+C+MINUS — отключить проверку совместимости на board-id.
    • CMD+K — загрузка актуального ядра, аналогично kcsuffix=release.
    • CMD+S+MINUS — отключить KASLR slide, требуется выключенный SIP.
    • CMD+S — однопользовательский режим, налогично флагу -s в аргументах загрузки.
    • CMD+V — логирование загрузки, аналогично флагу -v в аргументах загрузки.
    • Shift — безопасный режим, налогично флагу -x в аргументах загрузки.
    • Index — загрузка раздела соответствующего индексу.
    • Enter — загрузка дефолтного раздела или выбранного стрелками.
    • CTRL+Enter и CTRL+Index — выбрать выделенный раздел для загрузки по умолчанию. Требуется Misc-Security-AllowSetDefault=YES.

    CMD=Windows Key, OPT=Alt на windows ориентированной клавиатуре.

    В зависимости от вашего BIOS и типа клавиатуры доступные комбинации могут варьироваться.
    Больше деталей в актуальной документации.


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