Most likely it's either the memory or cpu. Check the bios version required for your cpu on tyan's website. And some of their boards require ecc memory. I always test a board with a bare post on a non conductive surface, such as a phonebook. Just use the cpu/heatsink, one stick of memory, and video to get a post screen if possible.
You may need to flash the bios with an older cpu or use bios man, the recommended vender. Tyan won't ship you an updated bios chip like some manufacturers. And don't assume a good memory module will work on your board. Some server boards are picky about memory type and brand. I would contact Tyan about recommended memory for your board, or check their website for tested modules.