Tyan Thunder K8HM no POST

It sounds like you?re an experienced hardware guy so I won?t bore you with the basics. When I?ve gotten stuck on a new motherboard no-booting problem these steps have helped me: -Make this as basic a machine as possible. You don?t need much of anything to get the POST to display and anything else just adds more variables. -double check the processor and memory, ensure they are correct for the board. Make sure the manual is the correct one for your board. -Try setting the BIOS to the manufacturers ?Safe? settings or default settings. You might even want to pull the backup battery out, unplug the power supply and let it set for 30 minutes to void the BIOS settings. -Verify the power supply is working correctly, preferably with a power supply tester. If you can?t then try putting this power supply in another computer to make sure it not only turns fans on but really supplies the correct voltage needed to make things work. -Buy or borrow a pre-boot test card. This is a diagnostic card that plugs into a PCI slot of your PC and will give you a much better diagnosis of what is going on. You can usually pick one up for about $35. - Make sure your CPU fan is plugged into the right motherboard connector, the newer boards will check for the CPU fan. I would suspect that if this were the case you would see something on the screen but you never know. Last but not least you might actually have a defective board. Granted it doesn?t happen too often but I?ve had two or three dead out of the box over the past few years. Chances are if you?ve gone thorough all of this and relate the steps to Tyan support they will send you a replacement. And if the new board does the same thing then you only have two remaining variables left; CPU and memory. Good luck and if you have any other questions please let us know.