Laptop hangs up at Classpnp.sys file.

Anonymous
2009-10-30T12:33:24+00:00

So I installed Windows 7 the other night on my laptop.  I did the driver updates and installed Norton.  I also installed Office 2007.  Then I shut it down for the night.  The next day I turned it back on to install a few more things.  A friend recommended that I install Ad-Aware, so I did, and ran it.  I've used it on a few of my machines before with no problems.  I installed a couple more programs (SANDRA & CPU-ID) then I shut it down for the night.  It stalled on shutdown.  I didn't think anything about it and after about 20 minutes I did the power-off.  I started it up the next day and it now hangs at the starting windows screen.  I've tried the following with all the same results:

  • System repair - hangs at the repair screen
  • Start normally - hangs at the starting windows screen
  • Start in safe mode - hangs at the classpnp.sys file
  • Start in safe mode with command prompt - hangs at the classpnp.sys file
  • start in safe mode with networking - hangs at the classpnp.sys file

I've even tried to put in the windows 7 disc back in to do a re-install and it hangs at the starting windows screen.

It seems like no matter what I try I get the hang up at the windows starting screen.

Someone help, please!!!

Windows for home | Previous Windows versions | Windows update

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Anonymous
2009-11-08T15:10:27+00:00

So the other night I tried a few more things with all the same results.  Here's what I tried:

  • I bought a second gig of ram, so I tried swopping out one stick, then the other - same results.
  • I bought a hard drive enclosure, removed the hard drive, formatted it with another computer, made sure I could save things to it, re-installed hard drive, booted from CD - same results.
  • I bought a brand new hard drive, installed it, booted from CD - same results.
  • Put old hard drive back in with both sticks of ram - same results.

After reviewing a few things, I found that when Windows gets to the "Starting Windows" screen, it's checking your hardware to make sure that things are OK.  Well, my hard drive, RAM, CD Drive, and Video Card are OK (I get all the right video stuff), so there's only a couple of things left, and one is the motherboard.  So, I believe that there is a hardware issue that is not allowing Win7 to completely load.

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Anonymous
2010-12-13T17:26:25+00:00

Go into your bios and check the hard drive configuration.   Once I reverted back to IDE the system booted as normal.  You may have to do the opposite!!!

At all times my system hung at classpnp.sys as advertised.  Let me know if this fixed

Macbionik.com

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  1. Anonymous
    2014-03-02T00:17:39+00:00

    Thanks for trying to help, but no luck at this end.  I could never get the <ctrl>c to work (no break or pause key).  It just hung there.  My many attempts to get a command prompt also failed.  I'm going to take the Dell techie at his word that basically the hard drive was too screwed to allow any fix.  (no choice any more).  Next keyboard, though, will have a break key.

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  2. Anonymous
    2014-03-01T16:33:57+00:00

    OK - once last try o help then that's the end of my knowledge on this.

    When you restart your laptop press <F8> continuously until this screen appears;

    then select "Safe Mode with Command Prompt"

    my guess is the command line that appear will freeze at this point;

    That's when you hit <ctrl>c or <ctrl><break> or <ctrl><pause break> or whatever old msdos command line command you can get to kill the frozen session. the laptop (I hope) should then go on to reboot in safe mode, after that just do a normal restart (from the task manager if you have to).

    I have not had any problems since I went through this sequence

    Good luck. A.

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  3. Anonymous
    2014-03-01T14:29:24+00:00

    Nah, there's no drive prompt so I don't think so.  Would I have been so lucky to see a command line . . . . then I could have proceded with a promising suggesting (to rename the classpnp.sys file that seemed to be causing the problem.  It shows up on the screen as the last line of code . . .

    I ended up spending a hour or two off and on with a tech from Dell and the conclusion is that the hard drive has to be replaced.  Even with the Install Disks, we couldn't get the hard drive to run anything except the Dell Diagnostics (which say everything is fine) and the bios/setup type menus and the other menus intended only for those gods more technically proficient than I.  Dell was very helpful (although it would have been nice to be told IN ADVANCE that the keystrokes I was entering would wipe the hard drive).

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