I have been working on building a new Opteron 280 Dual Core - Dual Processor system using a Tyan K8WE S2895 I purchased used off eBay. I have assembled the most bare bone of a system: 1 - Tyan K8WE Motherboard, 1 - 1 GB stick - ECC Registered PC2700 184-pin DDR ram, 1 - Opteron 280 Dual Core, 1 - GeForce 7600 PCI Express X16 256 MB graphic card, 1 - 475 Watt ATXEPS12v - 24 pin + 8 pin split power supply to test out the motherboard for any defects before continuing to purchase parts to build the final system. I have assembled the system with the Opteron 280 Dual Core seeded in CPU Socket 1 as defined in the manual for a 1 processor system, the ram in the first DIMM slot for CPU Socket 1, the graphic card in the first PCI Express X16 slot and the power supply in the 24 pin + 8 pin split connections. I have attempted to POST the system to make sure the board is not a DOA board and the fan on the processor starts up for 2 seconds the powers back down. The fans on the power supply don't even start. I have check the motherboard for any damage such as a bad capacitor or leaking capacitor. I have unseated and re-seated the processor. I have no way to test the processor because this is my only Socket 940. I have unplugged the power supply from the motherboard tried it in another system using the split power supply connection, it works so I re-connected it to S2895. I have unseated the ram tried it in another system, it works so I re-seated it. I have unplugged the graphic card and replugged it back in. I have no way to check the graphic card because all of my systems are AGP not PCI-Express. I have cleared the CMOS using the method listed in the motherboard manual. I have removed the CMOS battery and tested it. It still does the same thing. I have removed the graphic card to see if I can get the system to power up but no luck. I have even unplugged the ram to see if I can get the fans to start up. Still no luck. I have searched the techspot forums for a clue but haven't found a option other than it is a bad motherboard or bad processor or some other piece of hardware that I have tested so far. I have been researching the power supply to see what the minimum requirements are for this board but haven't found any documentation listing the minimum power needed to POST only that you need an ATX/EPS12V 24+8 split power supply to POST. Which I have. I am wondering if this power supply has enough power for this monster board to POST or not? I have ordered a ATX12V / EPS12V 630W Power Supply on eBay. It is a Raidmax RX-630A. I don't go nuts for Raidmax power supplies but Antec and Thermaltake doesn't have a power supply that this board will take, at least what I am seeing on their company website. I don't want to spend over $200 on one of the recommended power supplies from Tyan. I have researched this Raidmax power supply and it seems promising. I don't plan on using this power supply for the real system, it is only to check to see if the motherboard and processor are not DOA. This power supply is way to small for my needs. I plan on having a two dual core Opteron 280 processors, at least 4 GB of ECC Registered RAM thinking of more for Vista X64, 2 PCI Express X16 GeForce 7600GT 256 MB using an SLI bridge, 4 PATA hard drives, 2 SATA hard drives, 1 DVD-R/RW/+R/+RW/RAM drive and other internal hardware. I have most of the components except the second processor, 2 SATA hard drives and a more powerfully power supply. I am waiting for the new power supply to come in. Just wondering if this is the problem or am I thinking in the wrong direction? I am thinking that the power supply is not reaching a steady state to fully get turned on. I know that a power supply has two states. The first is the initial state and second is the steady state. The initial state is when the computer gets power turned on. This is a quick initial spike that happens until the power becomes stable for it to get the the steady state. The steady state is the phase that computer stays in until power is turned off. It is clear that the system isn't reaching this steady state. This can be to several reasons. The first is the power supply does not having enough power to handle that initial spike needed to kick start a system. The second is a defect in the motherboard or processor. The third and final, unless I have not thought off one, is a bad power supply. I have check the power supply itself and it works in another system. The processor I can't check because I don't have another Socket 940 to seat it in. I could purchase another processor but I am going to wait because I have ordered a more powerful power supply. I am hoping it works. I am thinking that the power supply is not getting to the steady state. It is obvious that the computer is jump starting on using the power switch pins that are on the motherboard's headers because the fan on the processor wouldn't have started. I have eliminated shorting out because this system is being tested on a cardboard box on a counter top. I am just wondering if I have missed anything, or if someone has a suggestion. In other words, Am I going in the right direction? Any ideas would be helpful?