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Windows 7: BSOD on boot logo, safe mode stuck at classpnp.sys

30 Apr 2012   #1

Windows 7 Ultimate 32-bit
 
 
BSOD on boot logo, safe mode stuck at classpnp.sys

Hi guys, I need help on my Acer 4750G here. I've been lurking around the internet lately searching for this problem's solution. But no answer

Here's the story:
So this morning my I started my laptop, it kinds of frozen/lagged so I had to shut it down via holding the power button 'till the screen shuts off. In school (I'm still 13-14) I turned it on, the booting took an unusual time to start. Then BAM! Bluescreen flashed about 1/4 second I tried to start it via safe mode, it stucks on the driver called "classpnp.sys". Seconds later, the same flashing bluescreen happened.

I've done these:
-System restore (It seems to do something, it gave me no result either)
-Memory Diagnostic Tool (It says no problem found, damn)

I've also done writing this line via recovery's command prompt:
rename c:\windows\system32\drivers\classpnp.sys classpnp.old
And no result either...

I'm not sure if the troublemaker is the hardware or driver. I might want to get it to the manufacturer's shop, but it'll be costy...

Anyway here's the bluescreen code written by me, I'm using my sister's netbook so no copy-paste thingy:

A problem has been detected and windows has been shut down to prevent damage to your computer

UNMOUNTABLE_BOOT_VOLUME

(I'll skip this part)

Technical information:

*** STOP: 0x000000ED (0x871F9A38, 0xC0000OB5, 0x00000000, 0x00000000)

I really need a quick answer, I'm gonna need my laptop for a presentation and I forgot to copy the data to my flash disk... any helps are appreciated!

~Alfrey48

My System SpecsSystem Spec
.

30 Apr 2012   #2
JMH

Win 7 Ultimate 64-bit. SP1.
 
 

Alfrey,
* Is your computer under Warranty?


* IF you are able to...
We do need the DMP file as it contains the only record of the sequence of events leading up to the crash, what drivers were loaded, and what was responsible.

If you are overclocking STOP.

You may be able to get the DMP files without crashing by booting into safe mode (F8) with networking.

To enable us to assist you with your computer's BSOD symptoms, upload the contents of your "\Windows\Minidump" folder.

The procedure:
Quote:
* Copy the contents of \Windows\Minidump to another (temporary) location somewhere on your machine.
* Zip up the copy.
* Attach the ZIP archive to your post using the "paperclip" (file attachments) button.
*If the files are too large please upload them to a file sharing service like "Rapidshare" and put a link to them in your reply.
To ensure minidumps are enabled:
Quote:
* Go to Start, in the Search Box type: sysdm.cpl, press Enter.
* Under the Advanced tab, click on the Startup and Recovery Settings... button.
* Ensure that Automatically restart is unchecked.
* Under the Write Debugging Information header select Small memory dump (256 kB) in the dropdown box (the 256kb varies).
* Ensure that the Small Dump Directory is listed as %systemroot%\Minidump.
* OK your way out.
* Reboot if changes have been made.
My System SpecsSystem Spec
30 Apr 2012   #3

Windows 7 Ultimate 32-bit
 
 

Quote   Quote: Originally Posted by JMH View Post
Alfrey,
* Is your computer under Warranty?


* IF you are able to...
We do need the DMP file as it contains the only record of the sequence of events leading up to the crash, what drivers were loaded, and what was responsible.

If you are overclocking STOP.

You may be able to get the DMP files without crashing by booting into safe mode (F8) with networking.

To enable us to assist you with your computer's BSOD symptoms, upload the contents of your "\Windows\Minidump" folder.

The procedure:
Quote:
* Copy the contents of \Windows\Minidump to another (temporary) location somewhere on your machine.
* Zip up the copy.
* Attach the ZIP archive to your post using the "paperclip" (file attachments) button.
*If the files are too large please upload them to a file sharing service like "Rapidshare" and put a link to them in your reply.
To ensure minidumps are enabled:
Quote:
* Go to Start, in the Search Box type: sysdm.cpl, press Enter.
* Under the Advanced tab, click on the Startup and Recovery Settings... button.
* Ensure that Automatically restart is unchecked.
* Under the Write Debugging Information header select Small memory dump (256 kB) in the dropdown box (the 256kb varies).
* Ensure that the Small Dump Directory is listed as %systemroot%\Minidump.
* OK your way out.
* Reboot if changes have been made.
The warranty is out of date...

The BIOS wont let me overclock the processor.

And last thing, didn't I just said on my first post that I can't boot my laptop?
My System SpecsSystem Spec
.


30 Apr 2012   #4

Win 8 Release candidate 8400
 
 

If you cant boot how did you run the memory diagnostics and the restore?

Did it give you any trouble prior to its last gasp?
My System SpecsSystem Spec
30 Apr 2012   #5

Windows 7 Ultimate 32-bit
 
 

Quote   Quote: Originally Posted by zigzag3143 View Post
If you cant boot how did you run the memory diagnostics and the restore?

Did it give you any trouble prior to its last gasp?
Using the "repeatedly-press" F8 button, then going to system recovery thing...
My System SpecsSystem Spec
30 Apr 2012   #6

Win 8 Release candidate 8400
 
 

Quote   Quote: Originally Posted by Alfrey48 View Post
Quote   Quote: Originally Posted by zigzag3143 View Post
If you cant boot how did you run the memory diagnostics and the restore?

Did it give you any trouble prior to its last gasp?
Using the "repeatedly-press" F8 button, then going to system recovery thing...
Did it give you any trouble (notification) before it went into cardiac arrest?

Can we please use the "repeatedly pressing the "F8" key to see if you can get into windows normally?
My System SpecsSystem Spec
30 Apr 2012   #7

Windows 7 Ultimate 32-bit
 
 

Quote   Quote: Originally Posted by zigzag3143 View Post
Quote   Quote: Originally Posted by Alfrey48 View Post
Quote   Quote: Originally Posted by zigzag3143 View Post
If you cant boot how did you run the memory diagnostics and the restore?

Did it give you any trouble prior to its last gasp?
Using the "repeatedly-press" F8 button, then going to system recovery thing...
Did it give you any trouble (notification) before it went into cardiac arrest?

Can we please use the "repeatedly pressing the "F8" key to see if you can get into windows normally?
No troubles happened before this incident... except a mass lagging...
My System SpecsSystem Spec
30 Apr 2012   #8

Windows 7 Home Premium 64 Bit
 
 

Copy & Paste - in Windows Recovery Console may help you get the files you need onto a flash drive. It won't restore your system, but at least it will give you options for your presentation.
My System SpecsSystem Spec
22 Jul 2012   #9

win xp pro sp3, win 7 ultimate 32 bit.
 
 

I don't know if it helps but i had exactly same problem and wasn't able to boot in neither normal nor safe mode.
This is what i did-------> First of all most probably your laptop is overheating(i didn't read your full post) if it is get a new battery,cooling pad and get you laptop's fan repaired and your laptop must boot in normal mode now.

For booting in safe mode-------> Go to C:\Windows\winsxs\x86_microsoft-windows-classpnp_31bf3856ad364e35_6.1.7600.16385_none_155984bf0d656ab3
and delete the classpnp.sys file.
That's it done.
Yes i am telling you to delete a system file but that is what saved me.
Just do as above and try to boot in safe mode it would again halt at 'Loaded drivers ....\classpnp.sys' but eventually will boot in safe mode after about 10 seconds.
WORTH A TRY. Trust me.

But everything is a waste if you can not boot at all not even in normal mode.
My System SpecsSystem Spec
22 Jul 2012   #10

Windows 7 Home Premium 64bit
 
 

I think I may know your error code... would it be UNMOUNTABLE_BOOT_VOLUME?
My System SpecsSystem Spec
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 BSOD on boot logo, safe mode stuck at classpnp.sys





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