You receive an "MCA_WARNING_UNKNOWN_NO_CPU" error message when you resume a computer from hibernation, and the computer is running one of the x64-based versions of Windows Server 2003 or Windows XP Professional x64 Edition

Support for Windows XP has ended

Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

Support for Windows Server 2003 ended on July 14, 2015

Microsoft ended support for Windows Server 2003 on July 14, 2015. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article has been archived. It is offered "as is" and will no longer be updated.
Symptoms
You use a computer that is running one of the x64-based versions of Microsoft Windows Server 2003 or Microsoft Windows XP Professional x64 Edition. When you resume the computer from hibernation, you may receive the following error message:
MCA_WARNING_UNKNOWN_NO_CPU
When this problem occurs, an event that is similar to the following event may be logged in the System log:
Event Type: Warning
Event Source: WMIxWDM
Event Category: None
Event ID: 106
Date: 8/12/2003
Time: 5:57:49 PM
User: N/A
Computer: ComputerName
Description:
Machine Check Event reported is a corrected error.
For more information, see Help and Support Center at http://support.microsoft.com.
Cause
Typically, this problem occurs because of an error in the computer's BIOS.
Resolution
You may be able to resolve this problem by upgrading the computer's BIOS. For more information about how to upgrade the BIOS, contact the manufacturer of your computer's motherboard.

Technical support for Windows x64 editions

Your hardware manufacturer provides technical support and assistance for Microsoft Windows x64 editions. Your hardware manufacturer provides support because a Windows x64 edition was included with your hardware. Your hardware manufacturer might have customized the Windows x64 edition installation with unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you need technical help with your Windows x64 edition. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware.

For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site: For product information about Microsoft Windows Server 2003 x64 editions, visit the following Microsoft Web site:
Winx64 Windowsx64 64bit 64-bit
Properties

Article ID: 895560 - Last Review: 01/16/2015 15:31:07 - Revision: 5.0

  • Microsoft Windows Server 2003, Datacenter x64 Edition
  • Microsoft Windows Server 2003, Enterprise x64 Edition
  • Microsoft Windows Server 2003, Standard x64 Edition
  • Microsoft Windows XP Professional x64 Edition
  • kbnosurvey kbarchive kbtshoot kbprb KB895560
Feedback