A Guide to the CLOCK_WATCHDOG_TIMEOUT Blue Screen of Death Error


Before I explain what this error means and how to fix it, I’m going to give you a little background information. First off, you’ve now encountered one of many infamous “Blue Screen of Death” errors.

You may have encountered them before. Depending on which version of Windows you’re using, you’re either seeing something that looks like this:

Blue Screen of the Past

Or this:

Clock Watchdog Timeout in Windows 8

What’s causing my problem?

Simply put, it’s your processor. Or, as you often hear it referred to, your CPU.

Graphics cards — or GPUs — determine the visual elements of what you see on your screen, while memory — or RAM — determines how much you can be doing at once. Hard drives serve as storage for your files and folders, and your processor is the raw power behind everything being done in your computer.

The CLOCK_WATCHDOG_TIMEOUT error means that your processor is having trouble with cooperation from its cores and threads. Threads are tasks taken by cores, and some cores can take many threads simultaneously. The problem here is that a thread is waiting for a proper response from another thread — or a core is waiting for a response from another core — and those responses aren’t coming. Therefore, you get this BSoD error.

While this is a processor problem, this can be caused by two things: a driver error, which is very likely if you’re using Windows 8, or the OS itself isn’t playing nice with the processor. First question: how long have you had this computer? Has it been working fine until now?

How do I fix it?

If so, just use System Restore to go back to a point where the system worked. Be wary of using any new devices that may have caused the problem.

If you’re able to boot into Safe Mode when your computer starts, run Driver Reviver to update all your drivers to their latest version. There’s a good chance this will clear up the problem.

You should also use Windows Update, and if you aren’t already using the latest device driver, install that as well.

Drivers are what is used to get your devices like your keyboard to interact with your computer, and while some misconfigured drivers can result in bad performance, bad drivers overwhelmingly result in BSoDs like CLOCK_WATCHDOG_TIMEOUT.

Windows Update can usually solve these problems, but installing new drivers is always advised if you don’t already have the latest version. You should also update your BIOS, which you can find at your motherboard manufacturer’s website, and install from there.

If, however, you can’t boot into your computer at all or this error is still occuring, you’re going to have to get personal help from Microsoft or your manufacturer.

Good luck.

Are you having a different Blue Screen of Death? Check out our comprehensive BSoD guide and find your fix!

Steve Horton

  • reviversoft

    Hi Sami,
    Thanks for your input! Something good to try as a possible solution.

  • ReviverSoft

    Hi Abel,
    If you’ve recently reinstalled Windows and are getting corrupt system files already, either your hard drive is going bad, or you’ve got some sort of malware. Try running a scan with Malwarebytes and see if that picks up anything. Good luck!

  • ReviverSoft

    Hi Matthew,
    Really odd. Sounds like you’re having an overheating issue when the laptop is running on battery power. Have you tried a replacement battery?

  • ReviverSoft

    Interesting. Thanks for the tip, Winminhein!

  • Robert Luis Fenech

    Silvan Hofer I have been clocking my 4770K to 4.8GHz and as I was trying to stable it I saw that I was uping the blk block I see you too have gone that root. Try putting the blk block back down to 100 and use the multaplier instead.

  • jacob tsibelman

    My error was Your pc has a problem,were collecting error info,and they need to restart my computer

  • Charlotte

    So… my dad just fixed my computer, and installed windows 10 preview on it. Every since my dad put in the video card and clocked up my computer, I’ve had at least 3-4 blue screens. WHAT IS HAPPENING!?!?

  • FrankThePlumber

    I received the CLOCK_WATCHDOG_TIMEOUT error, for the first time ever, on my one-year-old desktop system which is running Win8.1 and RAID0+1 configuration. Moreover, I’ve not made any adjustments to BIOS (eg: overclocking, energy saving, etc) nor have I introduced new hardware / drivers.
    While trivial in comparison to the actual issue, the system neither auto-rebooted / recovered from this crash event, despite the newly-designed-layout of the infamous BSOD.

    I am not happy, seeing such an elusive issue on a relatively brand-new system and O/S.

  • FrankThePlumber

    The issue can be summed up in a single word: Microsoft.

    That being said, I would never recommend moving to a new OS in its infancy. Wait 6-12 months, after public release.

  • Charlotte

    Shut up I got it to work, my machine was over clocked so my dad had to reset it

  • Barbro-Katrin Didriksen

    Våknet opp med min pc sånn to uke etter eg kjøpte den. Hadde mild panikk. Men da eg fikk den på igjen så va den i orden igjen. Får håpe det holder seg sånn :)

  • ulfat

    how provide more voltage?
    1st my dell laptop e5420 not taking any other window.not installing window .
    2nd if on it will display
    watdchout problem

  • loveme313

    trying to update my dell INSPIRON N5110 to windows 10 (it’s originally windows 7) and i got this screen :(

  • I have had my surface Pro 3 since Sunday. I have not done anything and have no idea what clocking or bios are. I am not a tech so I have no idea what any of you are saying. All I had open was a browser. This Surface came with Windows 8.1 so what is the issue?
    My Surface doesn’t seem to even be charging anymore, but I cant run it without the power cord.

  • rocko

    ligt an der Baterie auf dem bort habe es selber gehabt Bios mit jamper auf standart setzen und dan die bateri wechseln

  • rocko

    nicht vergessen datum und uhrzeit einzustellen

  • Dr. MKhalil

    Hi ,, what about 4790k@5.0 ghz ??
    >>>>>> Voltage needed ??

  • Matthew Wolffsohn

    If you haven’t overclocked than voltage is irrelevant.

  • Matthew Wolffsohn

    Your bad manners aside, the problem was caused by a bad overclock which hadn’t been tested properly – Aka, your Dad.

  • Ethan Staton

    I’m going to try driver reviver. If that doesn’t work, I’m probably going to have to buy more psu. If THAT doesn’t work, I might need a new motherboard.

  • Alexander Binovski

    I had this “Clock Watchdog Timeout” for the first time last night,

    -i7 5820k
    -MSI x99a Gaming 7
    -16gb Kingston Hyper x 2666mhz
    -GTX Titan x EVGA
    -Corsair RM850i

    I ran P95 and Intel burn test for hours last night with no BSOD, I read it could be a faulty core or a driver problem?

  • Alexander Binovski

    Will try but I ran P95 and Intel burn test with 1,271v and it past so yea?

  • Winminhein Tin

    Oh and the tempeture? In most cases, OC is just not needed.

  • Alex Savage

    Will keep that in mind.

  • Bull Sheise

    Changed the RAM and problem solved. No more BSOD.

  • Андрей Власов

    Перепробовал все!!! Тестил память, процессор, жесткий на ошибки проверял, толку не было… Решил проблему отключением в биосе встроенной в мать видео карты, видимо каким-то образом конфликтовали с моей установленной GTX570.

    p.s. Может кому пригодится инфа!!!

    Мое железо:
    Тип компьютера ACPI x64-based PC
    Операционная система Microsoft Windows 10
    DirectX DirectX 11.0

    Системная плата:
    Тип ЦП QuadCore Intel Core i5, 3300 MHz (33 x 100)
    Системная плата Gigabyte GA-Z68AP-D3 v2
    Чипсет системной платы Intel Cougar Point Z68, Intel Ivy Bridge
    Системная память 8109 Мб (DDR3-1333 DDR3 SDRAM)
    DIMM2: Kingston 99U5471-020.A00LF 4 Гб DDR3-1333 DDR3 SDRAM (8-8-8-22 @ 609 МГц) (7-7-7-20 @ 533 МГц) (6-6-6-17 @ 457 МГц)
    DIMM4: Kingston 99U5471-020.A00LF 4 Гб DDR3-1333 DDR3 SDRAM (8-8-8-22 @ 609 МГц) (7-7-7-20 @ 533 МГц) (6-6-6-17 @ 457 МГц)
    Тип BIOS Award Modular (02/21/12)
    Коммуникационный порт Последовательный порт (COM1)
    Коммуникационный порт Порт принтера (LPT1)

    Видеоадаптер Intel(R) HD Graphics (2112 Мб)
    Видеоадаптер Intel(R) HD Graphics (2112 Мб)
    Видеоадаптер NVIDIA GeForce GTX 570 (1280 Мб)
    Видеоадаптер NVIDIA GeForce GTX 570 (1280 Мб)
    3D-акселератор Intel HD Graphics
    3D-акселератор nVIDIA GeForce GTX 570
    Монитор Asus VW222 [22″ LCD] (85LMQS044423)

    Звуковой адаптер Intel Cougar Point HDMI @ Intel Cougar Point PCH – High Definition Audio Controller [B-3]
    Звуковой адаптер nVIDIA HDMI/DP @ nVIDIA GF110 – High Definition Audio Controller
    Звуковой адаптер nVIDIA HDMI/DP @ nVIDIA GF110 – High Definition Audio Controller
    Звуковой адаптер nVIDIA HDMI/DP @ nVIDIA GF110 – High Definition Audio Controller
    Звуковой адаптер nVIDIA HDMI/DP @ nVIDIA GF110 – High Definition Audio Controller
    Звуковой адаптер Realtek ALC889 @ Intel Cougar Point PCH – High Definition Audio Controller [B-3]

  • Азат

    I just wanted 4.3 Ghz on i5-3570k

  • Nathaniel Pillar

    “More psu” what?

  • Ethan Staton

    I meant a better power supply, bored much to be strolling through a year ago man? Lol

  • Zweihander


  • bizenya

    PEBCAM: Problem Exists Between Chair And Mouse.

  • Jesús Rios

    THATS IT THANK YOU SIR and i dont even do overclock new processor only

  • Nathaniel Pillar


  • Pretty sure it’s PEBKAC

  • Also don’t keep overclocking your cpu for too long. Even with a good cpu cooler your cpu will run into a problem with overheating. Buy plenty of silver thermal compound so the heat from your cpu is drawn to the heat sink or in some good cpu coolers with copper pipes the heat goes into the pipes. Using your cpu the way that is intended without overclocking also helps.

  • Rembert Muylle

    I can get 4.7, but running 4.5 for thermals

  • Rembert Muylle

    This was the problem, thanks a lot!

  • Infuriate

    Did someone tried Device Reviver? Did it work?

  • Silvan Hofer

    Thank you for your answer that long time ago xD Sorry never got a notification anywhere but that “cold problem” seems to be an issue generally, across cpu generations and mainboard manufactures.

    Another thing I noticed is, a pc can be stable for weeks or months and then crash multiple times short after each other the same evening. No idea why.


  • Aaron Lowe

    Updating windows isn’t an option for me because every time it’s updated the screen goes black. Been using for a while now with no problem with updates turned off. The windows service is disabled. But then got a load of updates which resulted in a BSOD. The problem is always caused by updates. It’s like a full time job trying to stop it updating.

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