Win 7/Z580: Black screen on boot up, before login screen?

Question

Win 7/Z580: 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/Lenovo community. I like to pick up the brain of this forum to resolve 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. 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 My Z580 is not responding to CTRL+ALT+DEL 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.
Z580 PC is not responding to control from command prompt (under Repair Your computer)  either.
Z580 is able to use the "Repair Your computer" tools after pressing F8 during booting .
Under local user login it provided Start Repair option. As I pick this option, I got the following. 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
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 will be glad to attach 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. ResultsFile 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.
It is puzzling me.
Thanks for helping.

Answer 1

I tried these steps 8/7/2015. 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 tried under F8 ===> Repair Computer===> Command Prompt ===> Works OK
Here is the result:
- Boot with Last Known Good Configuration (F8 menu) ===> Black screen with cursor in the middle
- Restore to a prior date (System Restore) - System Restore ====> Already reported in previous reply
- Try a clean startup Troubleshoot Application Conflicts by Performing a Clean Startup results in
Clean Start up
D:\Windows\System32>runas /user:administrator msconfig
Enter the password for administrator:
Attempting to start msconfig as user "MININT-84TH5FG\administrator" ...
RUNAS ERROR: Unable to run - msconfig
1060: The specified service does not exist as an installed service.
- Try loading defaults in BIOS - F2 ==> f9 ==> f10 ===> Black screen with cursor in the middle
Check if explorer.exe is running and start from CTRL+ALT+DEL (task manager - new task) ===> CTRL+ALT+DEL not responding
 Is anybody in this forum point me to fix? Thanks for looking into this issue.