Kernel Power Event 41

Applies To: Windows 7, Windows Server 2008 R2

Kernel Power Event 41



Windows Operating System






6.1 (Windows 7, Windows Server 2008 R2)


The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.


Kernel power event 41 is generated under different scenarios when the computer is shut down or restarts unexpectedly. When Windows starts, a check is performed to determine whether the computer shut down normally. If the computer did not shut down normally, Kernel Power Event 41 is recorded in the System event log.

The following are known causes of kernel power event 41.

  • A Stop error occurs and the computer restarts. When a Stop error occurs, the Stop error data is included in the event data that is displayed on the Details tab in Event Viewer.

  • The power button on the computer is pressed and held for four seconds. When the power button is used to stop the computer, PowerButtonTimestamp data displayed on the Details tab has a non-zero value.

  • There can also be cases when the Stop error data or PowerButtonTimestamp data are not recorded before the computer stops, even when these are the causes of kernel power event 41. In such cases these data entries are 0 (zero).


Kernel power event 41 indicates that something unexpected happened which prevented Windows from shutting down normally. Therefore, there might not be enough information to determine what caused the event. To determine a cause and a resolution, it is important to know what the computer was doing at the time just before the event occurred.

The Microsoft Support article Windows Kernel event ID 41 error in Windows 7 or in Windows Server 2008 R2: “The system has rebooted without cleanly shutting down first” describes procedures for determining the cause of kernel power event 41 by using the bugcheck data included in the event details.