Gigabyte EP45T-USB3P Shutdowns

[Architect]

I have been experiencing random shutdowns. I have read a few threads that indicate it could be a battery backup problem and am currently running a Tripp Lite SMART750USB Smart 750VA Line-Interactive UPS.

I have ruled out heat issues using speedfan, memory using memtest 86+, HDD's using disc check, made sure all drivers are up to date, run windows update and checked for physical damage on the board.

When I start it up all the red and orange colored lights on the board light up, sorry about the blurry picture but you get the idea:
http://i.imgur.com/Z2cah.jpg

Give me your wisdom internet.

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System Information
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Time of this report: 12/12/2011, 11:55:52
       Machine name: ULTRA
   Operating System: Windows 7 Professional 32-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.110622-1506)
           Language: English (Regional Setting: English)
System Manufacturer: Gigabyte Technology Co., Ltd.
       System Model: EP45T-USB3P
               BIOS: Award Modular BIOS v6.00PG
          Processor: Intel(R) Core(TM)2 Duo CPU     E8400  @ 3.00GHz (2 CPUs), ~3.0GHz
             Memory: 4096MB RAM
Available OS Memory: 3582MB RAM
          Page File: 1859MB used, 5303MB available
        Windows Dir: C:\Windows
    DirectX Version: DirectX 11
DX Setup Parameters: Not found
   User DPI Setting: Using System DPI
 System DPI Setting: 96 DPI (100 percent)
    DWM DPI Scaling: Disabled
     DxDiag Version: 6.01.7601.17514 32bit Unicode
PSU: Corsair GS600

[Dark Mantis]

Hi and welcome.

Nice picture! 

I would suggest removing your UPS/battery backup system from the loop and see if that makes a difference. On POST al the motherboard LEDs should illuminate and then go out as POST completes.

What PSU make and model is powering your system ?

check your power switch and reset switch on the case are not sticking or working improperly. If necessary remove them from the motherboard end and use the onboard button.

[Architect]

Corsair GS600

[Dark Mantis]

How old is it and can you post all your components please ?

[Architect]

Attached the dxdiag .txt. I bought the backup last August. If you mean the system I built it in 2009.

[Dark Mantis]

Well your PSU is a couple or more years old now then so it will be not 100% at peak performance now. It is a good make but not overly large for what you have it running. If you can get a larger unit of good quality it might be worth swapping them over to see if that is the root of your problem.

[Architect]

Any suggestions?

[Dark Mantis]

The dxdiag .txt doesn't list a lot of your components to be honest.  Also I did suggest trying a new/larger PSU if you can. Have you removed the UPS from the system and if so has it had any effect ?