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Windows 7: BSOD - Cannot pinpoint pattern - BCCode 50

12 Sep 2013   #1

Windows 7 Pro x64
BSOD - Cannot pinpoint pattern - BCCode 50

Hi guys,

I'm a new user here and plan to contribute where possible. Meanwhile, I have a new system build and I'm experiencing system crashes. I have already performed chkdsk /r, sfc /scannow, memtest scans, reviewed event viewer logs, and I am currently running driver verifier. At this point in time, I can't seem to pinpoint the cause of these crashes nor can I seem to find any type of pattern.

At this point in time, any guidance or help would greatly be appreciated. I have attached the SF Diagonostic logs in zipped format. Please let me know if anything else is needed.

My System SpecsSystem Spec
12 Sep 2013   #2

Microsoft Community Contributor Award Recipient

Microsoft Windows 10 Pro Insider Preview 64-bit

It says the BSODs are caused by the display driver.
BugCheck 50, {fffff8a001b2e000, 0, fffff880050eae1b, 0}

*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys

Could not read faulting driver name
Probably caused by : nvlddmkm.sys ( nvlddmkm+8aae1b )

Followup: MachineOwner
And it is the latest version of the display driver.
fffff880`04840000 fffff880`05325000   nvlddmkm T (no symbols)           
    Loaded symbol image file: nvlddmkm.sys
    Image path: \SystemRoot\system32\DRIVERS\nvlddmkm.sys
    Image name: nvlddmkm.sys
    Timestamp:        Fri Jun 21 14:36:16 2013 (51C41788)
    CheckSum:         00AB87FF
    ImageSize:        00AE5000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4
The latest version is buggy in some cases. Install the 314.22 WHQL only.
  • Uninstall All nvidia items in Control Panel > Programs and features
    • 3D Vision Control Driver
    • 3D Vision Driver
    • Graphics Driver
    • HD Audio Driver
    • PhysX
    • nvidia Update
    (Are you using nvidia chipset drivers? If so, dont uninstall anything other than those are listed).
  • Now follow Drivers - Clean Left over Files after Uninstalling
  • Boot normally now. Go to Drivers - Download NVIDIA Drivers, Download 314.22 WHQL. While installing, Select Custom (Advanced) install. In the next page, follow this settings:

Also do some hardware tests:

Stress test the Graphics Card using Furmark.
Video Card - Stress Test with Furmark

Test your RAM modules for possible errors.
How to Test and Diagnose RAM Issues with Memtest86+
Run memtest for at least 8 passes, preferably overnight.

Let us know the results.
My System SpecsSystem Spec
12 Sep 2013   #3

Windows 7 Pro x64

Arc, thank you for the fast response and evaluation. I will performed the above mentioned steps and get back to you ASAP. Thanks!
My System SpecsSystem Spec

15 Sep 2013   #4

Windows 7 Pro x64


The 314.22 WHQL drivers still produced the same result. After performing some research, I have discovered that there are driver issues relating to the GTX 780 video card. After downloading and installing the 326.80 drivers, all of my issues went away and haven't came back since.

Notable change in the 326.80 drivers:
  • TDR error may occur when the system is idle for several hours. [1330455]
I will mark this issue as resolved. Thanks for your help, Arc!
My System SpecsSystem Spec
15 Sep 2013   #5

Microsoft Community Contributor Award Recipient

Microsoft Windows 10 Pro Insider Preview 64-bit

Hi Matt .... 326.80 is still a BETA, and your issue was apparently was not a TDR. For TDR, the bugcheck codes are 0x116 and 0x117.

Still, as it is working good for you, that is very good news. :)

Let us know for any further issues.
My System SpecsSystem Spec

 BSOD - Cannot pinpoint pattern - BCCode 50

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