Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: New Build: I7-2600k, Win7 64bit, BSOD/Only booting on 1-2 CPU cores

24 Jan 2011   #1

Windows 7 x64
New Build: I7-2600k, Win7 64bit, BSOD/Only booting on 1-2 CPU cores

Have a strange problem on my new pc build.

Cooler Master HAF 912 Plus Midi Tower
Samsung DVD±RW burner, SH-S223C
Silver Power SP-SS750M 750W PSU
Intel Core? i7 Quad Processor i7-2600K
Corsair Vengeance? DDR3 1600MHz 8GB CL9
Crucial RealSSD C300 2,5" 64GB (for OS)
ASUS P8P67, Socket-1155
ASUS Radeon 5770 (from my old pc)

I ordered the parts and installed it a week ago, installed Win7 64bit Professional 64 bit, and all seemed to work fine, for 1 week. Pc has not been overclocked, using standard intel stock CPU cooler, got 5 case fans, having normal temps. Using default BIOS settings.

A few days ago, in the middle of a game, screen went BSOD. Tried to reboot, but got errormessage during boot, halts at "CLASSPNP.SYS". Tried booting in safe mode, repair mode, tried to reinstall Windows from DVD, but all stops at the same stage during boot "starting windows".

So far I have tried running Windows Memory Diagnostics to check ram, found no errors. Installed latest BIOS firmware, no change. Cleared CMOS/Bios, no change.
Checked the GPU/GFX card on another pc, worked fine. Tested booting from all 8 diffrent SATA connectors with the SSD device, no change. Tried reinstall Windows on a new, blank HD, fails during "starting windows" phase. (Reconnected the SSD after this)

Then I tried to reduce the number of active CPU cores in Bios, from 4 to 3, didnt boot. From 3 to 2 cores, it booted normally into Windows after this. Also on 1 active core. If I switch back to 3 or 4 cores, Windows stops booting at "starting windows" again.

Does anyone have any ideas what could be causing this?

Oslo, Norway

My System SpecsSystem Spec
24 Jan 2011   #2

Windows 7; Server 08; Window Home Server; Vista; XP

Try changing the sata mode from achi to ide and see if you can get it to install correctly. Others in MS technet have reported the same problem and switching to the opposite sata mode seems to have corrected the issue.

If not please post back.

My System SpecsSystem Spec
24 Jan 2011   #3

Windows 10 Pro

Check that you memory is running with the correct voltage and timings. See these posts -


My System SpecsSystem Spec

25 Jan 2011   #4

Windows 7 x64

No luck on the RAM and IDE/AHCI settings, however, I am getting a RMA on both the CPU and the Mobo, so I will probably get them replaced on warrenty now.
My System SpecsSystem Spec

 New Build: I7-2600k, Win7 64bit, BSOD/Only booting on 1-2 CPU cores

Thread Tools

Similar help and support threads
Thread Forum
Freeze when booting with more than 2 cores
Hi, so basically the problem is as the title says, my computer won't boot any version of Windows IF I enable more than just 2 cores on the BIOS. Specs: Asus M5A97 EVO R2.0 AMD FX6100 Six-core processor (no OC) 2x4Gb DD3 1300Mhz Kingston AMD Radeon HD 7750 1Gb 1x500Gb SSD Samsung Evo Overcase...
General Discussion
bsod 0x00000124 on new sb 2600k build
So i recently upgraded from a i7 960 to a i7 2600k bought a brand new board and used a set of ram i had laying around specs CPU: Intel Core i7 2600k Sandy Bridge Motherboard: GIGABYTE GA-Z68X-UD3-B3 Graphics Card: SAPPHIRE FleX 100314FLEX Radeon HD 6870 1GB Memory: ...
BSOD Help and Support
Starting my 2600k build today!
Well after going back and forth if i should do a build, a couple 2600k threads here convinced me it was time lol I am hoping to go 4.4-5ghz range :geek: Just a note, you will notice the low end video card, that was by design, it's just a temp card ;) Here is what I picked up. Motherboard...
PC Custom Builds and Overclocking
Freshly Build Win7 -64bit Computer Blue Screens or freezes randomly.
I recently build my first computer, using these parts (not sure what you need to know). Memory -*G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL9D-8GBRL CPU - Phenom II X6 1090t black edition Thuban 3.2GHz* PSU - Corsair CMPSU-850TX...
BSOD Help and Support
new build BSOD win7 64bit, i3 540 & MSI H55M-P31
Just threw together a new machine the other day only to have it bluescreen on me the first time I left it idling overnight with sleep/hibernate disabled. I didn't have the small kernel dump enabled for the very 1st BSOD, but it happened again last night, so I've got 1 large & one small dump ...
BSOD Help and Support

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

© Designer Media Ltd

All times are GMT -5. The time now is 09:34.
Twitter Facebook Google+