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Fatal Error Solutions

A parity error in the system memory or I/O...

STOP: 0x000000B9


The chipset detected an error. The chipset performs communications and other services between the processor and I/O.

Some older versions of Windows may show the description as "CHIPSET_DETECTED_ERROR".

This is a fatal Windows error, typically called a Stop message, Bug Check, or more commonly the Blue Screen of Death (BSoD). The system is in a forced reboot state. Any unsaved work is likely lost.

  Sample Screen  

A problem has been detected and Windows has been shut down to prevent damage to your computer.

A parity error in the system memory or I/O system was detected.

If this is the first time you've seen this Stop error screen, restart your computer. If this screen appears again, follow these steps:

Check to make sure any new hardware or software is properly installed. If this is a new installation, ask your hardware or software manufacturer for any Windows updates you might need.

If problems continue, disable or remove any newly installed hardware or software. Disable BIOS memory options such as caching or shadowing. If you need to use Safe Mode to remove or disable components, restart your computer, press F8 to select Advanced Startup Options, and then select Safe Mode.

Technical Information:

*** STOP: 0x000000B9

Beginning dump of physical memory
Physical memory dump complete.

Contact your system administrator or technical support group for further

Text may appear differently depending on where the error occurs.
Additional technical information (hex values) specific to a machine are not shown.
  Key Facts  
Full Title
  A parity error in the system memory or I/O system was detected. 

Stop Code


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  2000, XP, Vista, 2008, 7, 8

  Microsoft Corporation
  Solutions and Fixes  
  Date Votes ratings
Fix Thermal Problems
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If the problems only occur after the system has warmed up and never occurs after you turn on a cold system (i.e. has been off for at least 30 minutes), the parts may be getting too hot and are failing.

Often this kind of problem is related to poor air-flow through the PC. Desktops usually have between 3 and 5 fans. If any fan fails, runs slowly, or if the vents are blocked, internal high temperatures can cause all sorts of odd behavior and BSoD messages.

While the system is powered on, put you hand near the exhaust fans at the back and confirm you feel a warm airflow. If there is no airflow or it is very hot, it's a good bet you have fan problems. Also check the inlets and be sure they are clear of dust and debris. If you have pets, check if fur is blocking the inlet vents.

If you are comfortable opening your PC, turn off the computer and open it up. With the insides in good view, re-apply power and turn it back on. Check that each fan is working properly and they are not clogged with dust.

Be sure to check the CPU fan and the fan inside the power supply. Also many video adapters have their own small fan. Replace any slowly turning or defective fans. Also be sure no cables are too close to the fan blades, as they can limit airflow, or worse - stop the fan if they hit the blades.

Check if the processor heat sink/fan assembly is properly attached to the processor chip. It should not be loose and should be clamped tightly to the the processor.

If the fans are all working and airflow is good, you may have a defective CPU, memory or other hardware component.

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  FaultWire Staff
Posted: 4-Oct-2008
Fix Defective Hardware
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Confirm the hardware is working correctly using a hardware diagnostic program. If you suspect a specific hardware item, such as memory stick or video card, try replacing it with known good hardware.

Don't overlook the possibility that hardware was not installed correctly, especially anything you installed just prior to the problems starting. Make sure all cards and memory are securely seated in their slots. Verify disk drive cables are properly connected and are not loose.

Several software products that offer an extensive range of hardware diagnostics includes Fix-It Utilities Professional and SystemSuite Professional. Other diagnostic products include Eurosoft's PC Check and Iolo's System Mechanic.

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  FaultWire Staff
Posted: 5-Oct-2008
Load Chipset Driver
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Reload or install an updated chipset device driver.
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  FaultWire Staff
Posted: 2-Sep-2009

Also see our list of common Fatal Error Solutions.

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  Vendor Summary  
  Microsoft Corporation (more info...)

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    While BSoD fatal stop errors are identified by Microsoft Windows, they are often caused by non-Microsoft applications, drivers and hardware issues.  
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