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see if a bios update exists and make sure all your drivers are up to date. <br />
<br />

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see if a bios update exists and make sure all your drivers are up to date.



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this post from another site &amp;&nbsp;was success with this CMOS setting<br />
1. Disable CPI APIC support<br />
2. Under PCI/PnP settings, set Plug and Play O/S = YES.<br />
<br />

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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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thanks for sharing knoledge
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<div class="content wysiwyg-content">
USING Windows 7 X64 Professional (MSDN legit)<br />
Motherboard : ASUS P5B-E<br />
<br />
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, <br />
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. <br />
<br />
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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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?

Windows 7 hangs on CLASSPNP.SYS only on cold boots

Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.

Windows 7

A desktop computer is a personal computer designed for use at a single location due to its size and power requirements, usually by one person. The most common configuration has a case that houses the power supply, motherboard, disk storage (usually one or more hard disk drives and optical disc drives); a keyboard and mouse for input; and computer monitor and printer for output. The case may be oriented horizontally and placed atop a desk or vertically and placed underneath or beside a desk.

Desktops

A personal computer is a general-purpose computer whose size, capabilities and price make it useful for individuals, and is intended to be operated directly by an end-user with no intervening computer time-sharing models that allowed systems to be used by many people, usually at the same time. Personal computers may be connected to a local area network (LAN), either by a cable or a wireless connection, and through that to the Internet. A personal computer may be a laptop computer or a desktop computer running an operating system such as Windows, Linux or Macintosh OS.