Solved

Windows 7 hangs on CLASSPNP.SYS only on cold boots

Posted on 2011-03-02
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Last Modified: 2012-05-11
USING Windows 7 X64 Professional (MSDN legit)
Motherboard : ASUS P5B-E

everything was working fine until afew days ago i noticed when i do a COLD boot the computer does NOT start it hangs on windows logo, however if i just press RESTART it works fine,
once windows is loaded, i can do restarts and works fine, but if i do SHUTDOWN and start the computer again, on the FIRST boot computer hangs, i booted in safemode and it gets stuck on CLASSPNP.SYS with no HD activity.

here is the interesting part, if i shut down the computer, when i start dont do anything system gets hanged on CLASSPNP.SYS BUT if i shutdown, and when i start just go in bios and exit (dont change a thing), PC boots fine !!!! anyone has any idea what is going on?
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Question by:Raul77
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by:wrmichael
ID: 35019225
see if a bios update exists and make sure all your drivers are up to date.

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Expert Comment

by:upalakshitha
ID: 35023449
this post from another site & was success with this CMOS setting
1. Disable CPI APIC support
2. Under PCI/PnP settings, set Plug and Play O/S = YES.

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Accepted Solution

by:
Raul77 earned 0 total points
ID: 35029035
I tried both didnt work, then i found the answer in another forums

make sure BIOS EHCI Hand-Off is enabled under Advanced->USB Configuration in the BIOS

worked great incase anyone else is running into this problem.
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by:upalakshitha
ID: 35032839
thanks for sharing knoledge
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Author Closing Comment

by:Raul77
ID: 35067772
found the answer.
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