Stuck on Windows splash screen, safe mode stuck on classpnp.sys


  1. Posts : 6
    Windows 7 x64 Professional
       #1

    Stuck on Windows splash screen, safe mode stuck on classpnp.sys


    After a power outage 3 weeks ago I was having issues with the system going down at around 5 minutes and then less and less time after that. I was told it was a display issue and to uninstall and reinstall my display drivers. I uninstalled my drivers and it was still the same. I felt like it was temperature related. I found my graphics card (Radeon 5700) was dirty. I cleaned it and thought I was back in business. Everything was back to normal, all I needed to do was update my graphics drivers. Once that was done, my computer would no longer load past the Windows splash screen.

    I used Puppy Linux on a flash drive and I have access to everything. I can use the internet and access all my files. This to me says that it is not a hardware issue.

    The fact that when I try to go into safe mode it gets stuck for more than a day on classpnp.sys (when I finally give up). I understand that classpnp.sys has loaded but, there is something after that that the computer can't load. I have seen some people have atipcie.sys load after classpnp.sys and it makes sense to me that it would be a graphics driver that is causing the issue.

    I need my Windows 7 up and running for school and work projects. Any ideas, thoughts, or help would be greatly appreciated.
      My Computer


  2. Posts : 3,056
    Windows 10
       #2

    Hi :) ,
    Follow this tutorial to run SFC /Scannow at boot.


    If you want to run the command from a USB drive follow this tutorial.


    And apply it to the first link instead of the ERD (Emergency Repair CD).

    Generally a good tutorial to read.

      My Computer


  3. Posts : 6
    Windows 7 x64 Professional
    Thread Starter
       #3

    SOLVED
    THREE WEEKS without my computer! Occam's Razor... not Murphy's Law in this case

    In my hardware and operating systems class I was told that Last Known Good Configuration was ONLY use able if it was the FIRST thing you tried after a crash or mishap. On a whim I gave it a shot and sure enough I'm in and working all the scans. Both scf /scannow and chkdsk came up with 0 errors/issues. If you can think of any other scans to run let me know.

    In my case this boiled down to a power outage that triggered a temperature issue caused by a dirty graphics card.
      My Computer


  4. Posts : 3,056
    Windows 10
       #4

    Awesome .
    But I don't understand the reasoning behind the cause, sorry what did you mean?
    In my case this boiled down to a power outage that triggered a temperature issue caused by a dirty graphics card.
      My Computer


  5. Posts : 6
    Windows 7 x64 Professional
    Thread Starter
       #5

    The power went out as it so often does here in Florida. When the computer was restarted it began to shut the monitors off at 5-7 minutes. When restarted the computer would shut the monitors off at shorter and shorter intervals. Lets say I turned it on and the monitor said no signal monitor going to sleep at 7 minutes in. I would then shut the computer off at the power switch and restart it. This time the monitor would go to sleep at 5 minutes. I would repeat the process until I was left with less than 2 minutes which wasn't enough time to finish booting. I would then let the computer completely cool off. I cleaned the computer inside, neglecting the ATI Radeon 5770 graphics card because I knew nothing about it. I was still stuck with the monitor going to sleep. For a few days I worked and worked at trying to do something to diagnose the situation in the limited time frame I had but I was unable to. I was also unable to find anything online in any forum to help me understand what was going on. It seemed to me to be temperature related but I couldn't check that do to time constraints before the monitor went to sleep. My friend got me a new motherboard but I refused to put it in because I just felt that wasn't the issue.

    Finally, I took the graphics card out. It was quite dirty. I cleaned it and reinstalled it. For a moment everything fine, until I used the Dell website to reinstall the drivers. I only installed the critical/urgent one and then my system hung on the Windows Splash Screen. I tried Safe Mode, that hung on what ever was loading after CLASSPNP.SYS. I let both hang for a day each just to see if I was being impatient.

    Then I plugged a USB with Live Puppy Linux and everything was there and ok. This to me was more evidence that it wasn't the motherboard but perhaps a driver issue.

    After days of scouring forums trying to find someone who not only had the problem I had, but fixed it before adding my own post and getting scolded I decided to try using Last Known Good Configuration. I have to say I was PLEASANTLY surprised when it worked and I updated my graphic drivers (all of them) as soon as possible. Now everything is back as it was before the power outage.

    Did I explain it well enough? I hope this helps someone who like me was stuck without an answer.
      My Computer


  6. Posts : 3,056
    Windows 10
       #6

    Quite well thank you :) .
      My Computer


  7. Posts : 1
    Windows 7 Ultimate x64
       #7

    I had same problem after power failure. I have costum built pc with msi mobo. I got it work after going to bios(DELETE key) and changing it to fail safe defaults.
      My Computer


 

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