System Shut Down

Hi all, finished my first build 2 weeks ago and now having problems with random shutdowns with succesful reboots and sometimes fans on max and no output from 5 days ago. Hardware is :-

MoBo:Asus P5Q Deluxe.(BIOS 2301)
CPU: Intel Q9550.
Cooler: Noctua NH-U12P SE2.
PSU: Corsair HX 850W.
RAM: 2x2Gb OCZ PC2-8500 Reaper.
GPU: Sapphire HD5850.
HDD: WD 640 Gb 32Mb Cache.
Optical Drive: Sony NEC Optiarc DVD±RW burner AD-7241S.
Case: Antec 300 with 2 extra Noctua NF-P12 120mm Fans.

OS: Windows 7 Home Premium 64-bit OEM. All Drivers up to date. Latest ATI CCC. BIOS 2301 flashed using ASUSUpdate.

Event Log:

Error 2/8/2010 12:41:16 PM EventLog 6008 None
Log Name: System
Source: EventLog
Date: 2/8/2010 12:41:16 PM
Event ID: 6008
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: JPs-PC
The previous system shutdown at 12:12:18 PM on ‎2/‎8/‎2010 was unexpected.

Critical 2/8/2010 12:41:10 PM Kernel-Power 41 (63)
Log Name: System
Source: Microsoft-Windows-Kernel-Power
Date: 2/8/2010 12:41:10 PM
Event ID: 41
Task Category: (63)
Level: Critical
Keywords: (2)
Computer: JPs-PC
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.

These shutdowns happen at random, in-game, browsing, idle - between 5 mins to 2 hours after bootup - any ideas, questions welcome . . . :)
2 answers Last reply
More about system shut down
  1. Run memtest86 and see if any errors pop up in your RAM. Done any overclocking?

    Do some googling too.
  2. Thanks raybob, will try memtest - no OCing yet !
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