Issues with GA-M57SLI-S4 Looking for ideas

Hello,

I started to have random shutdowns several months ago. Sometimes it would be during the boot process or could be several hours later. Finally it stopped working. Fans and light came on only, no beep even when everything was pulled out of the system. I contacted Gigabyte and followed their tests with no results. They sent me an RMA and I returned the mobo. I recieved it back, installed it and nothing changed. I replaced the powersupply and CPU and still nothing worked. I pulled the mobo to do a POST outside the case (I know I should have done this first) with no results. Of course I think I jacked something up during the POST, because now the fans are not starting up. Therefore I am now at the this point and looking for ideas or suggestions.

Option 1 -- Return the mobo back to gigabyte again?
Option 2 -- Purchase a new mobo (if so, which model)
Option 3 -- Other suggestions

Thank you in advance.

System:

AMD BE-2350
Logisys 575W PCI Express
Corsair DDR2 2GB
Radeon x1600PRO PCIE 512M
Windows XP