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Windows 7 Blue Screen On Startup Classpnp.sys

This SYS file carries a popularity rating of 2 stars and a security rating of "UNKNOWN". Part A, Steps 1a - 6a How to burn ISO image using Windows Burn Disk Image. I waited almost 45 minutes with a black screen and a hyper active hard drive but hey presto it worked. So start removing hardware one at a time (includes memory modules) untill you get a good boot. http://digitalsurgeon.net/windows-7/windows-7-bsod-after-classpnp-sys.html

However, after choosing to boot off of CDROM with this inserted, there is a gray loading bar with "Windows is loading files...," but after this completes, the system gets hung up I could not find my original boot disc, but I tried running off of a Windows 7 Upgrade disc that I had, which I assumed would work the same. I removed one of the 2GB sticks of RAM, and sure enough, it works! Very occasionally it is caused by a loose hard drive cable.At 2012-06-19 09:12:00, Humphrey left the following comment ...Hi, your solution fixed the problem on my Lenovo G550. https://social.technet.microsoft.com/Forums/windows/en-US/566cdd43-ce91-4e64-93e0-8d09d8fc1ea0/windows-7-fails-to-go-into-safe-mode-stuck-at-classpnpsys?forum=w7itprogeneral

You decide to install that same card in a newer computer, but maybe is it worn out or maybe a protocol or electrical standard has been slightly updated in recent times... I don´t know why exactly but resetting the bios via removing the battery fixed it. The next line in the boot log says - Did not load driver @hal.inf,%acpiapic.devicedesc%;ACPI x86-based PC. These troubleshooting steps get progressively more difficult and time consuming, so we strongly recommend attempting them in ascending order to avoid unnecessary time and effort.

Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site. i hope this helps! Everything is connected and hooked up properly. After you have downloaded the ISO image you want to burn right click on the Start orb, then choose Windows Explorer. 3.

Please Note: Your CLASSPNP.SYS may not be related to hardware driver problems, but it's always a good idea to ensure all of your PC device drivers are up-to-date to maximize PC Improper shut downs, “hard closing” programs, corrupt or incomplete installation of software (eg. Type "regedit" and hit ENTER. http://www.solvusoft.com/en/files/bsod-blue-screen-error/sys/windows/microsoft/msdn-development-platform-u-s/classpnp-sys/ My computer then started running REAL SLOW!!!

So I was curious and tried putting back my infected(?) hard disk drive and it still let me do all the boots and repairs and everything. Restart and windows will create a new file. 4) I haven't tried this either, scanning with SFC. Password Advanced Search Show Threads Show Posts Advanced Search Go to Page... Then I would get the blue screen of death.

i started up the bios and switched my video to the vga on the motherboard instead of the vga on my radeon graphics card. Get More Info Try enabling and disabling this feature and try to restart your computer. Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. Problem should be solved.

If you have just added new memory to the computer, we recommend temporarily removing it to make sure it is not the cause of your CLASSPNP.SYS error. have a peek at these guys I tried system repair, no avail. After putting a note on his desktop, the computer started hanging. I had to change e SATA mode to IRRT Saturday, January 12, 2013 5:02 AM Reply | Quote 0 Sign in to vote I had the same problem.

Thursday, July 09, 2015 5:20 PM Reply | Quote 0 Sign in to vote Had the same problem... Hope this helps. finally I pressed f8 to get to advanced boot options and loaded debug mode. check over here You can disable all these apps quickly by going to MSCONFIG and then click on Startup Items.

Exit and restart. A case like this could easily cost hundreds of thousands of dollars. If that is the case, then it is likely you will need to replace the associated hardware causing the CLASSPNP.SYS error. Recommendation: Scan your PC for CLASSPNP.SYS registry corruption

You can also click the [ ] image to hide the instructions as you proceed through each step.

Acer, HP, Compaq etc) Press either alt + F10 or alt + F11. Finally I found a solution, though it was pretty tricky. To Start Windows 7 back in Normal Mode A) From step 2, look for the identifier (ex: {current}) for the OS description (ex: Windows 7) under aWindows Boot Loader section that First was my wifes toshiba and the above mentioned repair steps worked fine on it but now on an asus belongings to my motherin law its not working.

If it does not automatically run the repair but you are still having problems with Windows 7 repeat these steps to run Startup Repair again manually. Because of the time and complexity involved in updating drivers, we highly recommend using a driver update tool such as DriverDoc (Developed by Microsoft Gold Partner) to automate the process. Make sure to check the power supply and ensure that the power going into the motherboard is OK. http://digitalsurgeon.net/windows-7/windows-7-classpnp-sys-bsod.html I noticed that when windows would load files and freeze at classpnp.sys, the lights on my keyboard would go out.

The computer was working fine until one day when I returned from work and found that it would not wake up from sleep mode. Virus or malware infection that has corrupted the CLASSPNP.SYS file or related MSDN Development Platform U.S. Sometimes CLASSPNP.SYS and other blue screen errors can be related to problems in the Windows registry. The time now is 06:28.