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Windows 7: Continual Restarts / Freezing. No obvious cause.

10 Nov 2015   #1

Microsoft Windows 7 Professional 64-bit 7601 Multiprocessor Free Service Pack 1
Continual Restarts / Freezing. No obvious cause.

For the last few days my computer has been causing me big problems as it won't stay up for longer than about 10 minutes. It BSOD'ed 2 or 3 times, unfortunately I didn't get the error message. Now it has stopped doing that and either:

- Freezes with a combination of black and grey vertical and horizontal lines on the screen, along with some areas of colour
- Suddenly reboots, without warning or an error message.

Currently it isn't giving me a dump, although it was earlier. I've pasted the most recent minidump below. The BCC code has varied (eg one time it was d1, another time it was 7f)

A few things I've done to try and pin it down:
  • It hasn't (yet) fallen over while I'm in Safe Mode with Networking
  • Nothing new has been installed that I'm aware of.
  • The laptop lasts up to about 10 minutes before falling over.
  • The video driver is up to date.
  • Memtest was fine
  • A Malwarebytes scan was clear
  • I watched the temperature during one 10 minute period. It peaked at around 60 deg C, but was around 40 to 50 most of the time (including when it froze).




Dump File : 111015-21184-01.dmp
Crash Time : 10/11/2015 11:41:19
Bug Check Code : 0x0000007f
Parameter 1 : 00000000`00000008
Parameter 2 : 00000000`80050031
Parameter 3 : 00000000`000406f8
Parameter 4 : fffff800`02d0fa32
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+74200
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7601.19018 (win7sp1_gdr.150928-1507)
Processor : x64
Crash Address : ntoskrnl.exe+74200
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\111015-21184-01.dmp
Processors Count : 2
Major Version : 15
Minor Version : 7601
Dump File Size : 277,152
Dump File Time : 10/11/2015 11:42:33

My System SpecsSystem Spec
10 Nov 2015   #2

Win7 Ultimate X64

Please post the log files as indicated here

Blue Screen of Death (BSOD) Posting Instructions

You could also try a clean boot to stop any programs from loading at startup to see if it helps with any app conflicts

Troubleshoot Application Conflicts by Performing a Clean Startup

When checking temps are you monitoring cpu & gfx temps - either will cause trouble
My System SpecsSystem Spec
16 Nov 2015   #3

Microsoft Windows 7 Professional 64-bit 7601 Multiprocessor Free Service Pack 1

Hi there,

I hadn't reposted as for 3 or 4 days the laptop was OK. However it's now playing-up again (agghh). I've had 2 blue screens and a couple of times the machine has frozen and I've had the vertical black & white lines. Screen shot attached.

I've also posted the requested log files.

Any help would be much appreciated.


Attached Thumbnails
Continual Restarts / Freezing.  No obvious cause.-vertical-lines.jpg  
Attached Files
File Type: zip (24.8 KB, 3 views)
My System SpecsSystem Spec

16 Nov 2015   #4

Win7 Ultimate X64

all you have posted is a single dump file, there is much missing from your upload, please run the tool again and wait for a couple minutes for files to be collected before uploading
Have a look at someone elses BSOD upload to get an idea of what should be in there
also manually check your %system root%/windows/minidump folder and see how many dumps are in there
My System SpecsSystem Spec
16 Nov 2015   #5

Microsoft Windows 7 Professional 64-bit 7601 Multiprocessor Free Service Pack 1

Sorry about that, I'd slightly misread the instructions. Hopefully I've now got the right file attached.

I've looked in the minidumps folder and there's only one file in there. This may be because I ran ccleaner last week, if I remember correctly it was when I thought my problems were over (... which in retrospect was probably a mistake).


Attached Files
File Type: zip (419.1 KB, 4 views)
My System SpecsSystem Spec
18 Nov 2015   #6

Win7 Ultimate X64

Unfortunately a few dumps are generally required to look for a pattern in the crashes, your only dump is reporting an 0x7F error which is not conclusive
After more crashes post your files again. For the moment you could try running an sfc scan and memtest on your ram to check for errors

SFC /SCANNOW Command - System File Checker
RAM - Test with Memtest86+

Seeing as you are suffering serious gfx errors it may be worth reinstalling/updating your gfx drivers also
My System SpecsSystem Spec
24 Nov 2015   #7

Microsoft Windows 7 Professional 64-bit 7601 Multiprocessor Free Service Pack 1

Apologies for the delay in replying - I've been tied-up a couple of things, along with investigating this further. Last week I got to the point where I'd made no progress, so I tried re-installing Windows 7 with the intention of reverting to an old backup ... however it didn't sort things out, but I did get a number of BSODs (rather than freezes) so it has allowed me to gather the dumps, pls see attached.

I've also done a number of other things:
  • I ran SFC. It came-up clean
  • I ran Memtest. It did 8 passes with no errors.

Based on a couple of things I read I tried running Prime95 and the Intel Burn Test:
  • The first time I started running Prime95 it ran fine for half an hour, then the system went to sleep as I'd forgotten to change the power setting. I resumed Windows and the test restarted. After about 10 minutes Worker #2 got an error, which I think was "rounding was 0.5 less than 0.4". I immediately tried to get a screenshot and then open Windows Explorer but it BSOD'd. I rebooted. It BSOD'd again as soon as it had booted-up. I started in safe mode, then rebooted and re-ran Prime95. All in all I had 3 BSODs, each had a different BCC code.
  • I then ran Prime 95 for 9 1/2 hours with no problem. Both the machine and the temperature were stable. The previous error didn't recurr.
  • The Intel Burn Test completed successfully, 10 passes in 1751 seconds.

The machine is very unpredictable in how quickly it crashes. When I had that error with Prime95 it stayed-up for about 20 seconds after it restarted. It then did the same thing again. However after that it stayed-up for about 10 hours while I was running Prime95.


Attached Files
File Type: zip (450.5 KB, 1 views)
My System SpecsSystem Spec
24 Nov 2015   #8

Win7 Ultimate X64

Are you using readyboost ? if so stop for a while until you get this issue resolved.

As the crashes have carried over to a fresh install I would start with some more hardware testing (or you have carried over a dodgy driver etc)
Get windows upto date (you don't have SP1 installed) rerun SFC then work through some hardware tests, check HDD/GFX etc but GFX in particular as you had gfx issues in picture above and keep an eye on those temperatures, try installing speccy or similar which will give cpu/mobo/gfx/hdd temps to keep an eye on
My System SpecsSystem Spec
10 Dec 2015   #9

Microsoft Windows 7 Professional 64-bit 7601 Multiprocessor Free Service Pack 1

... so my laptop became stable for no obvious reason, hurray! I took the opportunity to revert to a backup image of Windows 7 and all was well for a couple of weeks. Now the BSODs have come back with a vengance; the machine is effectively unusable again. Ahhhhhh

Before I re-imaged it I ran a number of couple of other tests in a vain attempt to try and pin the problem down:
  • I ran the Major Geeks Stability Test for 5 1/2 hours with no problems.
  • I saw the Video Card Stability Test on Major Geeks . I'm slightly suspicious that about the video / graphics driver side of things, so I ran it. Although I got pretty jerky movement on the globes, it ran OK. However if I open another window (eg Windows Explorer or Core Temp) it then fails immediately with this message: "Stability Test Failed. Perhaps the video card switched into low-accelerated mode. If you overclocked your video card, you need to lower your GPU and Mem frequency. After reboot please launch a test again"

I've attached the high level dumps from the crashes since it became stable again. 3 of them mention ntoskrnl.exe. I don't know if that's coincidence or if my RAM is dodgy. Although, if it is I don't understand how it could have passed a couple of memory tests.


Attached Files
File Type: txt Dumps - 2015.12.10.txt (8.0 KB, 1 views)
My System SpecsSystem Spec
10 Dec 2015   #10

Win 7 Pro 64

One thing that had my laptop crashing (I mostly use it in a docking station) was overheating. The air vents and fan had gotten plugged with dust. Some canned air blew the dust out and the crashes stopped.

You may have a completely different problem, but this may be useful info for others. Good luck.
My System SpecsSystem Spec

 Continual Restarts / Freezing. No obvious cause.

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