Win 7: Black screen on boot up, before login screen?

Win 7: Black screen on boot up, before login screen?
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I find some interesting posting in this forum. Thanks for keeping this forum to help windows community. I like to pick up the brain of this forum to resolved the black screen issue. I am not sure, whether it caused by virus. I use Microsoft Security Essentials. I am not able to run this in command prompt.

I started my laptop this morning & login screen showed up. Once I entered my login credentials, I heard the sound that usually plays once a login is successful, but I ended up with a black screen. After this occurred, I had to hold down the power button to manually shut down the computer. Once I started it up again, I was prompted to do a system repair, which eventually ended up with all successful outcomes, but I now have a black screen with a cursor before the login screen now. I have no idea what caused this to happen. My laptop is a Lenovo Ideapad Model Z580 (500 GB HD, 6GB RAM).

I am not able to get into safe mode or any other mode, which all leads to a black screen described above.

Only able to use the "Repair Your computer" tools after pressing F8 during booting .

Under regular user login it provided Start Repair option. AS I pick this option, it did not find any issues.

Under Admin user login, it provided system recovery options. It is not picking up the recovery point created a while ago.

Windows Memory Diagnostics is not launching and shows a black screen without cursor.

I am able to get into command prompt. I tried the following there.

I am not able to run cmd as admin

I reviewed the past posting of this forum on this subject.

Windows 7 boots to an unresponsive black screen with mouse cursor...

System File Checker: Run sfc /scannow & analyze its logs in Windows 7 / 8

Windows Resource Protection could not start the repair service

How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe) program generates in Windows Vista

Force SFC to Run in Windows 7

Windows Resource Protection found corrupt files but was unable to fix some of them

SFC /SCANNOW showed up

"Windows Resource Protection could not start the repair service

I did "net start trustedinstaller"

"Windows Resource Protection detected pending repair restart the computer"

I ran repair options using sfc /scannow /offbootdir=x:\ /offwindir=D:\windows

and got "Windows Resource Protection found corrupt files but was unable to fix some of them "

I did findstr /c:"[SR]" %windir%\logs\cbs\cbs.log >sfcdetails.txt

I am not able to find any [SR] tags in sfcdetails.txt . This file is empty.

It is puzzling me.

Thanks for helping.

From sfc /scannow command your windows is assigned D in recovery environment and perhaps %windir% is not recognized, so try the command:

Thanks for your suggestion. As I mentioned, I am not able to get to CMD.exe as Admin. I got to cmd window using Start Repair.

I found the D:\windows\logs\CBS\CBS.log of 5MB size.

As per your reply, I tried with


It created a sfcdetails.txt with 0 bytes.

Is there way to get to safe mode to Restore?

Any Idea, what is causing this situation?

Thanks for helping.

Copy cbs.log to a working PC, zip it and post here.

Thanks for your suggestion. How do I copy cbs.log to a working PC?

Will my current command window allow me to access external flash drive?

What is the command to use in command window to copy files?

Thanks for sharing.

Thanks for looking into my issues. As per your request, I am attaching the cbs.log zip file.

The pc that has issues, not responding to Windows Logo keys as well.

**** I tried SAFE Mode. It loaded couple of drivers and paused at CLASSPNP.SYS load. It went to Black screen with cursor at center.

I am able to invoke control pannel from Command prompt of working PC by typing control.

This issue PC is not responding to control from command prompt either.

Waiting for next steps !

Thanks for helping.

Did you find [SR] tag in attached CBS.log?

Where to go from here?

Thanks for sharing

Sorry I couldn't check any threads since yesterday, and still not home. Hopefully tonight in a few hours.

Alright, nothing in cbs.log.

Can you perform System Restore? http://www.sevenforums.com/tutorials/700-system-restore.html - Option 2

Thanks. I understand. System Restore says no restore point. I did local user Startup Repair. I am getting.

Code:

[COLOR=#333333][FONT="Helvetica"]Problem 
signature
 Startup repair offline
 1 - 6.1.7600.16385
 2 - 
6.1.7600.16385
 3 - unknown
 4 - 21200332
 5 - autofailover
 6 - 
4
 7 - NoRootCause
 os v - 6.1.7600.2.1.0.2561
 locale id – 
1033[/FONT][/COLOR]

Does it means something ?

How are you loading the System Recovery Options? http://www.sevenforums.com/tutorials/668-system-recovery-options.html

Can you get to F8 menu (Advanced Boot Options - http://www.sevenforums.com/tutorials/666-advanced-boot-options.html) and select "Last Known Good Configuration"?

Also try "Enable Low Resolution Video (640x480)" after that.

I am able to use the "Repair Your computer" tools after pressing F8 during booting only . All other options leads to Black screen with cursor in the middle

Last Known Good Configuration leads to same

Enable Low Resolution Video (640x480) leads to same

See if you can actually open a task manager in black screen.
- Check if explorer.exe is running and start from CTRL+ALT+DEL (task manager - new task)

- Also try loading defaults in BIOS

CTRL+ALT+DEL & Windows Logo Keys are not responding on Black screen.

What do you mean by "loading defaults in BIOS"? Is it a hardware reset?

Will it cause loss of Hard Disk data?

I did search in this forum.

The threads talked about additional issues upon BIOS reset. Am I heading there?

I ran the SFC again. I am attaching the zip file that contain CBS.LOG & [SR] tag extract (xxx.txt).
I did not any find ERRORS there, SFC ended with message saying "found corrupt files but was unable to fix some of them" . It is misleading. There is no [SR] tag pointing to corrupt files.

Does SFC through false positive like this?

I ran chkdsk. Results

File verification completed.
0 bad file records processed.
0 EA records processed.
CHKDSK is verifying indexes (stage 2 of 5)...
Index verification completed.
0 unindexed files scanned.
0 unindexed files recovered.
Windows has checked the file system and found no problems.
0 KB in bad sectors.

Failed to transfer logged messages to the event log with status 50.

Try scanning the harddisk with Windows Defender Offline - What is Windows Defender Offline? - Windows Help

Leave BIOS reset for later (it won't affect anything on your HDD but may require some confuguration "only if" you had changed settings yourself before.

Edit: Did you have Service Pack 1 installed on your PC? It looks like you did not..

Thanks. I tried Windows Defender Offline. picked ( 2nd option ) On a USB flash drive.

I am getting "There was a problem formatting selected USB flash drive" Error Code 0007-80004005

I tried with different Flash drives. All gives same error. I manually formatted (FAT, NTFS, ...) the USB drives. Result is same.

I searched this forum. There are threads suggests to ISO format for USB.

How can I make this work?

Ok, re-run the downloader, but choose the 3rd option - As an ISO file on a disk (Advanced)
Download and run Rufus (https://rufus.akeo.ie/)
Select the USB flash (Device), the ISO file (CD icon midway down on the right) and click Start.

Then restart PC and boot with that USB flash drive.

Thanks. I created WDO on CD instead of USB.

I used this CD to boot the infected PC. I ran the scanner. Here is the outcome

QuickScan - It did not find virus/Malware
FULLScan - It did not find virus/Malware (it took 4+ hours)

I back to square one

What else I can do from here?

Tried check disk yet?

http://www.sevenforums.com/tutorials/433-disk-check.html - Option 2 for you
Make sure you are selecting the correct drive letter. D in your case?

Yes , I did chkdsk /r on command line, because I was not able to get login. I posted the results earlier. Here you go again.

I ran chkdsk. Results for D:\

File verification completed.
0 bad file records processed.
0 EA records processed.
CHKDSK is verifying indexes (stage 2 of 5)...
Index verification completed.
0 unindexed files scanned.
0 unindexed files recovered.
Windows has checked the file system and found no problems.
0 KB in bad sectors.

Failed to transfer logged messages to the event log with status 50.

Updated on 8/7
============

Here are my HDD config:

Volume ### Ltr Label Fs Type Status Info
---------- --- ----------- ----- ---------- ------- --------- --------
Volume 0 F WDO_Media64 UDF DVD- Healthy
Volume 1 C NTFS Partition Healthy
Volume 2 D Windows7_OS NTFS Partition Healthy
Volume 3 E LENOVO NTFS Partition Healthy
Volume 4 G FAT Removable Healthy
Volume 5 LENOVO_PART NTFS Partition Healthy Hidden

I ran CHKDSK /F /X for C, D, E. All resluted to "Windows has checked the file system and found no problems."

F8 ===> Repair Computer===> Command Prompt ===> Works OK
F8 ===> Repair Computer===> Start up Repair ==> Results into "Startup repair could not detect a problem"

F8 ===> Repair Computer===> System Restore ===> "No restore points has been created on yout computer system drive"
F8 ===> Repair Computer===> System Image Recovery ===> "Windows cannot find a system impage on this computer"
F8 ===> Repair Computer===> windows Memory Diagnostiyics ===> "Black screen with Cursor in the middle"

After getting into Command prompt

I run net user

User accounts for \\

-------------------------------------------------
Administrator Guest
The command completed with one or more errors

It did not list other users in my laptop. I do not know why?

I need to pick the brain of this forum for these issues.

Thanks for looking into .