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Windows 7 PC Won't Boot - Stops At ClassPNP.sys


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#1 r44712

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Posted 28 July 2016 - 08:28 AM

I've ended up with a PC that refuses to boot - gets as far as the "Starting Windows" screen, waits for a while and reboots - repeatedly.

Starting in Safe Mode, it gets as far as ClassPNP.sys before stopping (for some time) and rebooting.

I've tried:

  • Startup Repair - fails with an error that what looks like (and what I can remember), "O/S does not match".
  • I do not possess the installation DVD.
  • The BIOS does not have the option to switch between IDE, ACHI, Auto, etc. The BIOS has been 'factory reset'.
  • I've run CHKDSK more than once, with auto-repair (and some other option, can't remember which).
  • I've run SFC with the (what I can remember as) the C:\ and C:\Windows specified, several times, each time it ends with "I've tried to fix it, but I can't". So I got the CBS.Log onto another machine, ran the command that extracts the "SR" entries into another file. When I examined that file, all of the entries looked "OK" (no errors). All of the errors I could find were to do with Windows Updates (and 'TrustedInstaller' giving up).
  • "SeaTools" (nor CrystalDiskMark) report the drive as defective.

I've attached the CBS.Log, here.

What else can I check? Can anyone help, please? 

Attached Files

  • Attached File  CBS.zip   114.21KB   3 downloads

Edited by r44712, 28 July 2016 - 08:36 AM.


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#2 Stancestans

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Posted 28 July 2016 - 09:10 AM

Disable automatic restart on system failure and post a clearly focused photo of the BSOD.



#3 r44712

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Posted 28 July 2016 - 05:18 PM

Thanks for the offer of help.

 

"Unfortunately" there's no BSOD, just a reboot.



#4 hamluis

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Posted 28 July 2016 - 06:07 PM

http://www.howtogeek.com/howto/windows-vista/help-troubleshoot-the-blue-screen-of-death-by-preventing-automatic-reboot/.

 

I would try the above...there usually is a BSOD by Windows when a reboot occurs, unless it's due to system overheating.  Even then, I believe that Windows notes the reboot, if not the possible cause.

 

Louis



#5 CKing123

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Posted 31 July 2016 - 10:24 AM


"SeaTools" (nor CrystalDiskMark) report the drive as defective.

That means that your only option is to backup immediately, replace your disk, and restore from backup :(

 

You said you ran chkdsk. Did it attempt to repair anything?

 

 

Edit- About the ClassPNP.sys:


Driver Description: SCSI Class System Dll

 

Driver Update Site: Windows Update

-CKing


Edited by CKing123, 31 July 2016 - 10:28 AM.

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#6 hamluis

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Posted 31 July 2016 - 11:24 AM

Either OP left out "neither" from SeaTools mention or he means something else, IMO.

 

Louis






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