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First - I have gone through as many possible solutions I've found here and elsewhere.

[Edit - to describe the issue in more detail, the PC appears to boot correctly, but instead of the logon screen, I have been getting a black screen WITH the pointer cursor, and it responds correctly to the mouse. Pressing CTL-ALT-DEL brings up the logon screen's background, but with no logon area nor any other content. This screen was at the full resolution before I uninstalled the graphics driver in safe-mode.]

I also just ran a full up-to-date AVG scan from boot media.

[Edit - the AVG scan, which was updated to today's virus signatures, found no issues at all.]

So - steps I've tried:

  1. Safe Boot, Restore from before the issue - done, no help.
  2. Uninstall the graphics driver - done, now i have a 1024x768 fallback screen, still no way in.
  3. sfc /scannow - only doable from Safe boot obviously, but no change.
  4. [Edit - booting from restore media, performing a startup repair and...]Restore further back - restored to 2 days ago, and I'd had many reboots since then with no problem.
  5. Enable autologin to try to get beyond the login screen - done, doesn't work.

It seems the best advice is complete reinstall, but I really don't want to do that because it'll take 3-4 days to add all the apps I use.

Some key points to note - in both states - before and after removing the video driver, I always had a mouse cursor on the screen. CTL-ALT-DEL flashes up the login background, but no login info.

I can (and often do) reinstall from scratch, but was at a fairly stable state before this, and would prefer not to.

-Paul

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I assume you have removed the video driver completly. – Ramhound Dec 21 '12 at 16:07
    
@ramhound yes, and when i do boot fully back I'm now in fallback 1024x768, with exactly the same behaviour - ie black screen, with cursor, ctl-alt-del temporarily brings up the login screen background. – PJC Dec 21 '12 at 16:19
    
Have you tried to boot with a Widows 7 disc to do a repair? – CharlieRB Dec 21 '12 at 17:48
    
@CharlieRB - yes - I should amend the question - the second rollback was from boot media, and after a startup repair. – PJC Dec 21 '12 at 17:56
1  
Have you tried to chkdsk the system drive? – gronostaj May 6 '13 at 13:18

This really sounds like something has corrupted user permissions/account. I have never actually seen this on a system that was working before but this link looks promising: http://www.sevenforums.com/crashes-debugging/27414-blank-screen-cursor-but-no-log-screen.html

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Already tried everything on that thread with no joy, plus note this PC has been running happily for over a year. – PJC Dec 21 '12 at 18:49

Maybe your winlogon.exe, and its libraries are corrupted. You could try to repair that. If that's not the solution try to repair the %winroot% with another (fresh) installation. I mean go to another computer install your Windows version on it (or a virtual machine), and clone the fresh %winroot% to your corrupted Windows installation (make sure you backup your system before doing that!).

share|improve this answer
    
Can you specify HOW to repair the files? – td512 May 16 '15 at 8:33
    
Extract the files from the windows installation disk and paste these to your system32 folder. – Adem May 16 '15 at 13:58

protected by bwDraco Jan 28 at 16:22

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