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Windows 7: Win7 Black screen of death with cursor on all boot modes

10 Dec 2013   #1
erpol

Windows 7 ultimate x64
 
 
Win7 Black screen of death with cursor on all boot modes

KSOD with cursor
I usually fix my computers (that I build) myself, but I'm appealing to the accumulated wisdom here because I'm at my wits end and trying to avoid reinstalling Windows from scratch and putting back software for a week... Needless to say I went through all the tutorials and how-tos on BSOD, KSOD, Windows won't boot and the like, especially on this forum.

My computer is running Windows 7 Ultimate x64.

Symptoms:
My computer wouldn't come out of hibernation (happens once in a while), so I forced it shut and restarted it. Since then it won't boot:

Boot in Normal mode: Black screen with cursor. Keyboard active (num, caps work), no mouse
CTRL-ALT-DEL or any other key combination = nothing

I'm able to go into the Windows boot menu by pressing F8, so:

Safe Mode: same, with bigger cursor
Safe Mode w/ Networking: same
Safe Mode w/ Command Prompt: same
Last Known Good Configuration: same
Low resolution boot: same
Leaving the black screen on for some time: nothing

What I attenpted so far (to avoid unnecessary responses and waste of time):

- Went to the "Repair options" screen (from windows boot menu):
- Startup Repair (numerous times): Disn't find any problems
- System Restore: Could not find restore point (which is false, as I have some automatic restore points)
- System Image Recover: Couldn't find image
- Windows Memory Diagnostics: no problems found

Then I went to the command prompt, and everything I tried from here on was from there:

- Chkdsk on the boot disk = no problems found. I could check that all my data (which sits on different disks anyway), is there and safe, so rescueing's not the issue.

- Windows Defender Offline: Ran that, no issues

- SFC Scan: Now this is interesting, because it will run with the usual options (/scannow /offwindir=c:\windows /offbootdir=c:\, it will report that it found corrupt files and successfully repaired them, but I think it does nothing at all.
The cbs.log file holds lots of stuff, but absolutely no sign of any relevant action - neither which files had an issue and were fixed, nor of the fix itself. I searched for the [SR] marker, and there are none to be found.

It's like SFC found problems, but could neither fix them nor tell me about it. I attached a copy of the CBS.LOG file, if its contents mean something to someone...

If anyone can help me with this, they would be my savior!!

Thanks to all


My System SpecsSystem Spec
.
10 Dec 2013   #2
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

Please post exact sfc command you did. (I think it was correct btw). It took many minutes to complete? did it report "no integrity errors found" ?
It doesn't create a logfile because you ran it in recovery environment. To create a logfile:
Code:
set  WINDOWS_TRACING_LOGFILE=C:\CBS.log
after that run the SFC command. When it has finished you have a file C:\CBS.LOG
My System SpecsSystem Spec
10 Dec 2013   #3
erpol

Windows 7 ultimate x64
 
 

Hi Kaktussoft, initially I thought you hadnt read my post through, as not only does SFC create a log file, but I attached it to my first post! The file is created in X:\windows\logs\cbs, and is different each time I run SFC.

FYI, the exact SFC command sequence & response is:
Code:
SFC /scannow /offwindir=c:\windows /offbootdir=c:\
Analyzing system. This operation may take some time

Windows resource protection found some damaged files and was able to repair them.
Details are to be found in the file CBS.log
But reading your post I changed the environment variable just in case, and guess what - I get a completely different CBS.log in C:\!

Unfortunately, I looked at it and it doesn't help me solve my problem - I get a million entries, and a certain number of them report something like:

"POQ 18957 starts:
0: Move File: Source = [l:162{81}]"\SystemRoot\WinSxS\Temp\PendingRenames\863b0e2bc4f5ce01525a000010029402.$$.cdf-ms", Destination = [l:80{40}]"\??\C:\Windows\WinSxS\FileMaps\$$.cdf-ms"

Which doesn't make much sensefor me, but I attached the file (zipped) in case it makes some for you.
What I'm sure of is that SFC doesn't actually DO anything, since I get the same report (with different timestamps) each time I run it...
My System SpecsSystem Spec
.

10 Dec 2013   #4
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

The SFC command DID fix some problems. Can you run it again and recreate and post a logfile?
My System SpecsSystem Spec
10 Dec 2013   #5
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

What do you see when trying to boot to safe mode? Do you see all drivers scrolling over screen? It freezes at CLASSPNP.SYS?
My System SpecsSystem Spec
10 Dec 2013   #6
erpol

Windows 7 ultimate x64
 
 

YES absolutely! The safe mode file list stops dead at CLASSPNP.SYS, then I get the black screen.

At some point yesterday I asked for a boot logfile (ntbtlog.txt) for a normal boot, and there classpnp.sys loads normally in the middle of the log somewhere. The last entry is successful, it's srv.sys.

I appended the latest CBS.log, I did 2 reruns.

Thanks for spending time on my problem, I really appreciate it.
My System SpecsSystem Spec
10 Dec 2013   #7
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

Quote   Quote: Originally Posted by erpol View Post
YES absolutely! The safe mode file list stops dead at CLASSPNP.SYS, then I get the black screen.

At some point yesterday I asked for a boot logfile (ntbtlog.txt) for a normal boot, and there classpnp.sys loads normally in the middle of the log somewhere. The last entry is successful, it's srv.sys.

I appended the latest CBS.log, I did 2 reruns.

Thanks for spending time on my problem, I really appreciate it.
CLASSPNP.SYS isn't the culprit, it is just the last driver in the list... .same on this machine.

It looks like sfc command did fix the problems. But why do these problems reoccur???!!!

please run the sfc command again 2 times. Then set the environment variable to create a log file. Then run sfc command again. No reboot in between!! Post the log file created.
My System SpecsSystem Spec
11 Dec 2013   #8
erpol

Windows 7 ultimate x64
 
 

I know, it's totally incomprehensible for me as well. From the outside, everything seems to be perfect.

To be fair, it's not correct to say that Windows isn't booting - it does up to a point, then stops somewhere short of the login screen, with no clear reason, and not totally hung either.
And it's consistent over time, I booted perhaps a 100 times with always the same results, even changing the HD location etc. I also ran SFC a fair amount of times, with or without reboots in between.

One other thing that baffles me is why the "repair environment" doesn't find any restore points? I'm fairly sure that there are a number of them, even automatic ones when I update a driver and such (which I didn't do recently, to remove this question)... Isn't there any other way of accessing them?

One other thing I tried as well (scary but not so risky): I renamed the 5 registry files, then replaced them with their saved versions in C:\Windows\System32\config\RegBack. The backup was of 2 days prior to the problem. Same results! Put them back.

Now I did exactly as you suggest: I ran SFC twice, then set the environment variable, then ran it again. Didn't reboot, the log is in the zip file. Hope it helps, but I have the impression of performing a magic ritual here!

PS: I'd love to see the bright side of life right now! It's been 4 days and this is my main work rig...
My System SpecsSystem Spec
11 Dec 2013   #9
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

Quote:
To be fair, it's not correct to say that Windows isn't booting - it does up to a point, than stops somewhere short of the login screen, with no clear reason, and not totally hung either.
Not totally hung??? Please explain.


Restore points are gone .... don't know why. SFC did fix many things, but next run the problems are still there.. very strange.

Did you run an offline virusscan already?

Did you install/uninstall something just before the problems started?
My System SpecsSystem Spec
11 Dec 2013   #10
erpol

Windows 7 ultimate x64
 
 

By "not totally hung", I mean that the keyboard reacts (caps lock, numlock), which is not the case if all is frozen... Now apart from that, I must admit that it's all but hung...

Yes, I did run the Microsoft offline virus scan on a bootable key. It found nothing.

And no, I installed nothing on the computer for the week before the crash.

One thing I noticed by looking at the directories on the disk, is that the "Internet explorer" folder is accessed at every pass of SFC - both in program files and program files (x86).

At this stage I would even try a paying 3rd party utility, if one existed that could help solve my problem...
My System SpecsSystem Spec
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 Win7 Black screen of death with cursor on all boot modes




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