Restarts - No Error Screen

Hey guys, I've got a really annoying problem that I've been dealing with for awhile and hope you can help me out.

Basically, sometimes when I try to load a game, or when I try to turn my computer off, it will just cold restart itself. It doesn't happen 100% of the time, but most of the time. I unchecked the "automatically restart" option, and I still get no error screens, just a restart.

The only event logged is:

Log Name: System
Source: Microsoft-Windows-Kernel-Power
Date: 12/3/2009 5:24:41 PM
Event ID: 41
Task Category: (63)
Level: Critical
Keywords: (2)
User: SYSTEM
Computer: Wintermute
Description:
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" />
<EventID>41</EventID>
<Version>2</Version>
<Level>1</Level>
<Task>63</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000002</Keywords>
<TimeCreated SystemTime="2009-12-04T00:24:41.877214600Z" />
<EventRecordID>10910</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>Wintermute</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="BugcheckCode">0</Data>
<Data Name="BugcheckParameter1">0x0</Data>
<Data Name="BugcheckParameter2">0x0</Data>
<Data Name="BugcheckParameter3">0x0</Data>
<Data Name="BugcheckParameter4">0x0</Data>
<Data Name="SleepInProgress">false</Data>
<Data Name="PowerButtonTimestamp">0</Data>
</EventData>
</Event>

It was also restarting in this way when it would go into sleep mode, but I stopped it from doing so. I've updated my drivers to the best of my ability, I just replaced my PSU because I thought that might have been causing the problem, but it has persisted with the new unit.

Hopefully you guys can help me out, it's sort of harding trying to find information about this without any type of error screen.

Thanks.

Thanks for the quick reply.

A minidump folder does not exist, and a search for MEMORY.DMP came up with nothing.

Here's the sys.nfo.

Thanks

Hi Gang,
I am having the same issue and am curious to know if you've had any success. I've seen several threads and everyone leads back to a BSOD but I have never had one. Just random reboots with the same Kernel-Power issues (pasted below).
I cleared out drivers and let Windows reload them (to the best of my knowledge) and while the reboots lessened in frequency, they are still happening way too often. I also followed the steps to create a minidump...no files are being created when the reboot happens. I am including my sys.nfo in hopes that someone can point me in the next direction.
Thanks!

Log Name: System
Source: Microsoft-Windows-Kernel-Power
Date: 12/7/2009 12:59:33 PM
Event ID: 41
Task Category: (63)
Level: Critical
Keywords: (2)
User: SYSTEM
Computer: ComputerRoom
Description:
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" />
<EventID>41</EventID>
<Version>2</Version>
<Level>1</Level>
<Task>63</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000002</Keywords>
<TimeCreated SystemTime="2009-12-07T19:59:33.766400000Z" />
<EventRecordID>86567</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>ComputerRoom</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="BugcheckCode">0</Data>
<Data Name="BugcheckParameter1">0x0</Data>
<Data Name="BugcheckParameter2">0x0</Data>
<Data Name="BugcheckParameter3">0x0</Data>
<Data Name="BugcheckParameter4">0x0</Data>
<Data Name="SleepInProgress">false</Data>
<Data Name="PowerButtonTimestamp">0</Data>
</EventData>
</Event>

I have the exact same problem, win 7 restarts without error.
Sometimes when i try to load a game and always when i try to shutdown or restart the PC, i have to log off and then shutdown the machine.
Updated all drivers and so on.