Windows 7 Hangs On CLASSPNP.SYS - Even When Using A Boot Disk?
Sep 10, 2011
So I really have no idea where to start, I can usually fix things myself but I can't even get to somewhere useful.I have made no hardware or firmware or any changes since last successful boot. Mac OS X boots up fine from my second HDD (my laptop has PC architecture, it's not Apple). Removing this second (OS X) HDD and then attempting boot makes no difference. What gives? If I can't boot from a Windows USB then...it must be hardware related? But Windows was working fine with exactly the same hardware for ages. Plus it's all still recognised in Mac OS X, so nothing has suddenly broken. My 4x4GB RAM SODIMMs are still fine, so is the CPU and GPU, sound card, wireless card...I really don't know what I'm looking for.
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Sep 3, 2012
I upgraded my Phenom and MSI mobo to a Gigabyte 990XA-UD3 & FX-6200 Bulldozer. ll worked relatively okay. It would crash after around 2-3 hours use, consistently.Temps were not too high, but very very strange, they were fluctuating around 7-8 degrees a second, never going above 35 or below 25 celsius, but every second it would drop or incresase by around 7 degrees and the fan would spin much faster/slower in parallel with this.I updated BIOS using @BIOS (Which I know learn doesn't work) which gave me many issues. I managed to load the original F2 BIOS back on via usb, however that left me in a state where my PC would turn on (lights/fans on) but nothing more, nothing on display or anything. Using my old Phenom I managed to update the BIOS to the latest (F12), where it would now boot with my bulldozer.
When I say boot, it was not recognising my HDD. It is recognised in BIOS and in command prompt, but it is not deteced via the windows installer. After many attempts to resolve this the one that worked was the cleanall function in command prompt. SInce it has been detected I have installed and reinstalled Windows about 3-4 times (setting the drive as AHCI, IDE, using optimisid defaults etc) but it now has this issue where it either hangs at 'starting windows', it hangs for a second at 'starting windows' and then BSOD's and reboots, or (when i try to boot into safe mode) it stops at the CLASSPNP.sys driver and then BSOD's and reboots.As I have said my BOIS is fully up to date and functional, and I have tried all the different settings, in particular AHCI/IDE and the optimised and fail safe defaults. I have also ensured all unecessary USB drivers or accessories are disconnected on boot/windows install
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Feb 10, 2013
I've been scouring the internet trying to fix a boot issue with my Dell XPS 420. It worked fine last week but on Saturday started to blue screen. I installed a new HD and installed a fresh copy of Win7 64-bit. I reinstalled my ATI video drivers but nothing else (e.g. I had to update a load of codecs for Win7 on the other install). I tried booting again from the original hard drive and everything came back with no errors. I left the PC up overnight, and now I get the same blue screen with various errors. So I disconnected from that hard drive and tried to boot from the fresh install, now it blue screens there as well. So I hit F8 and tried to boot in Safemode with Networking. Hangs at the casspnp.sys file. Then tried to boot from the DVD and repair but the repair only gets so far and yet another blue screen.I have 8gb of RAM onboard, and I have an ATI 2400 video card installed that is jacked into a Panasonic plasma display. Other than that, I've not customized anything else. I've ruled out the RAM as I swapped it out. Could be the DVD as it was having what appeared to be I/O issues. However, it seems to work fine with I press F12 and boot from the DVD. I have this PC connected to a Port Authority KVM. I've reset the KVM as well. I also have a USB hub in the mix as well. I reseated my RAM, the DVD cables.
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Dec 20, 2011
1 year back I upgraded vista to windows 7 Home premium.3 days back I had problem - my starting windows page was hanged and was not proceeding forward, also All types of safe mode was getting stuck on classpnp.sys.After reading many forums I booted with USB (mounted with windows 7) and used command prompt and deleted all "pcmcia" realted files from C drive. Now using F8 function I can't use any option (all option safe mode, low resolution, startup repair,etc won't work, even changes in Bios setting won't work). Also now while booting my PC with USB, after starting windows page, black screen appears with white arrow and it won't go further this black screen so now I can't even use command prompt & Installation option
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Oct 19, 2012
I went into msconfig on the work laptop and changed the boot to safe boot network, as soon as I went to boot up the laptop and get into safe mode, the laptop freezes at CLASSPNP.sys then I have to reboot.I need to get it to boot back into windows normally, but even selecting "Start windows normally" sends it to safe mode because I set it to boot there in msconfig. What can I possibly do? I've tried running start up repair but says it cannot repair the issue. Due to security, the laptop hard drive has been encrypted with truecrypt, and therefore when I put the OS DVD in to try and do something from the command prompt, there are no OS's listed as installed so cannot alter the bootmbr or any windows files.
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Apr 10, 2011
Win 7 x64 Home Premium w/Gigabyte GA-EP45-UD3P, v.1.1 (P45), works great in IDE mode. (N.B.: eSATA port is just regular SATA port w/cable as provided by Gigabyte.) Trying to install external eSATA HDD. First I enabled AHCI drivers via registry. Then I turned on AHCI in BIOS. When I save BIOS and reboot, boot hangs when DVD writer performs sniffer boot, i.e., HDDs aren't found.
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Feb 21, 2013
Earlier today my second GTX 680 came in the mail. I opened up my PC to install it and after putting it in and attempting to boot my PC it gets stuck while loading windows. I tried safe mode and it got stuck on classpnp.sys. I've attempted removing my second 680, my SSD, put in a boot CD. Nothing seems to be working.
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Mar 20, 2010
When I boot up Windows 7 it gets to the "Starting Windows" screen which includes the Windows Logo with some animation. Once there it just hangs for about 5 minutes, then starts normally.I have Home Premium, 64 Bit, Dell XPS, Intel i7, 6BG of memory. I have several peripherals connected directly to it: Display, USB External Drive, Webcam, Bluetooth adapter.I tested booting in Safe Mode and it was very fast with no delay.I don't restart Windows 7 often so not 100% sure of when this really began. After the install booting up was very very fast. So this happened over the last month or so.The only hardware item I would mention is a Realtek card/usb reader which is built in to my unit as part of it. After Win 7 install it did not work at all and it took quite a while including working with Dell to finally track down the appropriate drivers. Now the unit works fine but I believe the problem began around that incident.Prior to uninstall or disabling the item I just wanted to check and see if this problem has been seen and make sure I am not going to do something to simply create a new problem. Also, since it was so difficult to finally get this Card Reader up and running I am concerned about just uninstalling it.
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Mar 19, 2011
I've been having some strange problems with a fairly new PC and I was hoping the community could help. It all seems to stem from my windows Explorer not functioning properly, but I'm worried it could be a hardware issue. This computer is fairly new.
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Feb 15, 2012
tion-issue for more info on that. Anyway I am past that point and windows is up and running fine except for one issue. It's my dad's laptop and he always thinks he can fix issues himself, one day when he had vista about 3 or so months ago he was having some boot issues, so he went inside bios and I believe changed some things around, he really has no idea. I addressed the issue but ever since he made changed his computer takes an incredibly long time to boot up, could this be something he changed in bios? On windows 7 it hangs on Starting Windows and with Vista it did it at basically the same place when the windows logo first appears with the loading bar.
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Jun 6, 2012
I recently had a windows 7 start up problem. I tried to boot in safe mode but it hung on classpnp.sys and then went to start up repair.It has been trying to fix errors for nearly 9 hours so i figure its not actually working.I have tried to cancel the operation but when i hit the cancel button it says i cannot cannot cancel the repair operation.I have tried to pull the power, but it then just goes through the same cycle and i end up back at the start up repair screen and in able to cancel it or go any further. I cant even get to the repair menu.I figure that i need to reformat and reinstall windows.
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Jan 5, 2012
windows 7 disk boot failure insert system disk and press enter
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May 7, 2012
I tried starting my computer today, but it kept coming up with a screen that said: Error 0xc0000225 Boot selection failed because the required device was inaccessable"I tried googling it, but the problem seems to come frop people messing with partitions.I haven't so much as looked at a partitioner siince I got the computer (Just the two standard partitions: the system one and the C: drive)
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Oct 7, 2011
I have a new toshiba laptop that the O/S failed to load after shutting down. It hangs at the bootup level when showing the windows logo.
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Oct 22, 2011
I regularly clean and reinstall windows on my computer, but this time it won't work. I am trying to upgrade my system from 32 bit to 64 bit, and when I try to boot (from DVD or flash drive) it gets to the windows splash page but never gives the option to install. It's just the mouse on a blue background.
I've done everything I can think of, even downloaded a pirated version to see if it would make a difference!
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Dec 28, 2011
So, I need to know if I can install windows 7 x64 via direct boot when I start up my computer it is in ISO format. So like my default boot will be my DVD drive to install it. can I do that with it being ISO format?
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Mar 25, 2012
I tried to add a new 1TB HDD into my computer. not realizing what i was doing wrong. i just threw it in there no software or anything. now my PC is getting "DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER" and i no longer have my windows 7 disk. is there anything i can do ?
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Jun 17, 2009
Anyone managed to get this to work? For anyone not familiar its a UMPC, currently running XP Pro. I created a new partition for Win 7 (x86 RC) and installed it there.
It went through the installation and various reboots until it said it was finished but now just hangs during the final reboot. I've tried safe mode - same thing.
Anyone had more success? Is there anything else I can do during booting or install to try and diagnose the issue? I am assuming its a hardware or driver issue.
I've successfully installed on several other desktops and laptops its just this one giving the problem.
Is it worth trying a newer build?
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May 5, 2009
I have the official RC1. I checked the MD5 sum and it came out fine (for once). I did not burn the DVD at max speed so I could avoid write errors. However, I have tried to boot from the DVD on 3 computers and cant get past the "Press any key to boot from CD" prompt. the weird thing is, all 3 computers display "Press any key to boot from CD o"
I press a key and nothing happens. Why is that little "o" appearing at the end?
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Dec 3, 2009
Everytime i start my computer from cold i go through my bios screen then come to the windows 7 screen where the windows fly to you and float/wave It hangs wont go to the log in screen or anything. I have to do a force shut down with my power button. When i start my computer again it goes fast to the "windows did not boot properly screen" I click start windows normally and it boots super fast. and on every restart it boots fine. Just from a first cold start.. What could be the problem?
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Jul 28, 2011
Since a coffee spill on the keyboard, my laptop won't normally boot as it did before.ow it just hangs on boot screen. It takes somewhere between 10s and 5min to boot.ometime it requires to be reset several times to actually boot windows. I switched RAM, the problem persisted. Every component in my laptop is working (Wifi, Ethernet, Sound etc.) What should I do?
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Mar 29, 2012
im usin 2tb segate new hard disk sir..in my system i cant able to boot my os and also my hard disk...its showin that hard disk boot failure insert system disk press enter ...i restarted many times its sayin the same problem...in my gigabite mobo bios my hard disk is not get detected sir....the problem is that wen im installin the new os for 2nd time its all went nice only sir but at the completion of the os it wil ask for the user name and password but in my system its frozen sir fully of black screen and i cant able to do anythin so i restarted my system from that im gettin this error as hard disk boot failure insert system disk press enter.....that my new hard disk and all of my data is in that hard disk only..this problem arises wen im installing the os for 2nd time sir.
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Aug 27, 2011
I woke up this morning, and I found that my computer was displaying this message"Disk boot failure, insert system disk and press enter". There are a ton of needed documents on the computer, and I'm hoping that they can be saved some way.
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Oct 13, 2010
I've been having this error even after reformatting and reinstalling Windows 7 on my desktop. I've done reformatting / reinstalling Windows 7 several times, yet the problem still occurs. I'm thinking of my HDD as being corrupted or messed up. The problem occurred after I accidentally hit the CPU when I was stretching my foot. The screen froze after that. Upon rebooting it, 'Disk boot failure, Insert system disk and press enter' occurs. After I entered the DVD installer of Windows 7, the screen just hangs.
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Feb 17, 2010
I have been having a bit of trouble with windows 7 lately, namely that it won't start up right. When I boot from the drive normally, it gives me the classic "BOOT DISK ERROR: INSERT SYSTEM DISK AND PRESS ENTER" message.
However, I soon discovered that if I boot from the Windows 7 cd and do not boot from it (By ignoring the "Press a key to boot from CD or DVD..." Windows 7 boots up fine.
I've tweaked my BIOS over and over, but the same problem persists. The drive is brand new and fine. What can I do?
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Jan 10, 2013
My friend bought a new PC and needed to put am OS on it. He put in the W7 disk and the error message 'disk boot failure insert system disk and press enter' appeared before installation was shown. He has tried changing around BIOS and it also recognises the hard drive and DVD/ CD ROM drive. Here is the specification he was given:Case : CIT Reaper Black Mesh fronted Tower CaseMotherboard : Gigabyte 78LMT Motherboard TechnologyCPU : AMD Bulldozer FX 4170 4.2ghz 8mb CacheHard Drive : 1tb Sata Hard DriveMemory : 8gb DDR3 1600mhz MemoryOptical Drive : 24x Dual Layer Sata DVD WriterGraphics Card : Nvidia Geforce GTX 650 2gb GDDR5 With HDMIPower Supply : 750 Watt Branded Power Supply Also, he has tried booting BIOS in different order
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Jul 11, 2012
I've had since cloning my drive.I was originally running Windows 7 Pro x64 and Win XP Pro x86 on a WD 150GB VelociRaptor, but cloned these partitions to a OCZ Vertex 4 128Gb SSD. Both OS are available at boot up and Win 7 runs fine. However, if I select Win XP it hangs at the welcome screen (blue screen with no login icons). I have tried safe mode, but get a similar blue screen with just 'welcome' on it. If I put the original drive back in, it works fine.I used Acronis True Home to clone the drives as I have used it on many occasions with no issues. But just in case this was the issue I tried EaseUS partition manager, but still have the same problem. I really want to avoid reinstalling XP as I have legacy programs that I no longer have the installation discs for.I had recently run Intel Rapid Storage Technology 10.8.0.1003, only because I wanted to ensure all drivers and systems were up to date prior to cloning. XP still worked fine on the HDD, but don't know whether this could be linked to the issue or not.
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May 31, 2011
Running Windows 7 Ultimate x64. I have setup a partition which I transfered from on drive to another and now my boot partition is on an SSD Raid array connected to an LSI 9260 controller. If I boot the computer with the RAID Array first, the computer will just hang there. No message no nothing after the Verify DMI success message. If I setup my computer to boot from CD first and the the RAID Array second and with a bootable CD in the drive, the BIOS will display the "Press any key to boot from CD" If I don't touch anything, then windows will load just fine when the boot sequence switches to the RAID Array.
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Nov 15, 2009
OK, I had the issue that several people have had with windows hanging at the "Starting Windows" Screen. I discovered that disabling the USB 2.0 Controller in BIOS allowed me to finish the install, and boot into windows normally. I re-enabled the controller and booting into windows hangs at the same place as before...turning it back off fixed it again.
My problem is that my only disk drive is a USB external drive, and I will probably be doing some file transfers using USB...I need the speed. Installing windows took a LONG time at USB 1.1.
Flashing to new BIOS and running windows update will be tried today to see if that will solve the issue but I wanted to post to see if anyone had some ideas that I hadn't thought of.
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Jan 28, 2013
I have an ssd and my windows usually boots really fast, like around 15 seconds. Recently though, I've encountered a problem where after the glowing windows icon and before the login screen I get a black screen for about 1-2 minutes. I have no idea what might be causing this and I want to fully experience my SSD's capabilities. I miss being able to reboot in a matter of seconds instead of minutes. My SSD is doing great, it doesn't seem to be failing at all, still super fast after the boot. I've tried googling it but its kind of a catch all and most things I find are windows hanging indefinitely during boot.
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Sep 5, 2011
When starting the computer, I keep getting "Disk boot failure, insert system disk and press enter". Nothing works other than putting in the boot disk and hitting the restart button on the tower. Then it will boot up and run fine. But how do I stop it from having to have the disk in order to load? Checked in the BIOS and the hard drive is the first load.
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