Random PC restarts

Hello everyone! I don't know why I'm getting these random PC restarts (no BSOD). I tryed to update the bios, unplug and plug all the PSU cables, clean all the dust, replace termoconductive paste, nothing worked. By the way, the PC could restart after 5 min i turned it on, or after 5 hours and when it does it restarts a few times in a raw.

PC specs:

Motherboard: Asus P6T SE
Processor: Intel Core i7 920
Video card: Gainward GTX275 896MB
DIMM1: Nanya M2Y2G64CB8HA5N-CG 2 GB DDR3-1333 DDR3 SDRAM (8-8-8-22 @ 609 MHz) (7-7-7-20 @ 533 MHz) (6-6-6-17 @ 457 MHz)
DIMM2: Kingmax FLFE85F-B8MH9 2 GB DDR3-1333 DDR3 SDRAM (9-9-9-24 @ 666 MHz) (8-8-8-22 @ 592 MHz) (6-6-6-16 @ 444 MHz)
Audio card: Asus Xonar D2/Pm
PSU: OCZ Stealthxstream 600w
Optical: ASUS DRW-24B1ST

PC sensor informations:

I also hear a strange sound from the HDD area, listen carefully at 0:10 (restart) and 0:44 (start up):


P.S. Sorry for my bad english. :??:
2 answers Last reply
More about random restarts
  1. hdd failure wont cause pc to shutdown.

    not windows updates are they?
    check the event log under device manager. see whats there (if anything) and let us know.
  2. No windows updates.

    - System

    - Provider

    [ Name] Microsoft-Windows-Kernel-Power
    [ Guid] {331C3B3A-2005-44C2-AC5E-77220C37D6B4}

    EventID 41

    Version 2

    Level 1

    Task 63

    Opcode 0

    Keywords 0x8000000000000002

    - TimeCreated

    [ SystemTime] 2012-08-02T15:27:35.194010000Z

    EventRecordID 23640


    - Execution

    [ ProcessID] 4
    [ ThreadID] 8

    Channel System

    Computer Schwichel-PC

    - Security

    [ UserID] S-1-5-18

    - EventData

    BugcheckCode 0
    BugcheckParameter1 0x0
    BugcheckParameter2 0x0
    BugcheckParameter3 0x0
    BugcheckParameter4 0x0
    SleepInProgress false
    PowerButtonTimestamp 0
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