z800 won't boot. No video post or any video activity with 6 beeps sound pattern.

my Z800 bios ver3.6 motherboard 1.02 rev (-002 board), it doesn't boot and i have 6 beeps paterns sounds on boot, no videos nothing.

i stripped it from all PCIe cards , changed ram, changed 2 CPUs X5672 with older X5560

performed CMOS reset and PSW reset. thied other GPUs FX1800 and FX580 also a AMD HD69xx series

with no luck...

the machine was showing wiered signs before with a Tesla M2090 GPU with  memory test warnings 209 errors on post on good ram dimms . i thing my latest bios config with NUMA  on and Allow compute on all PCIe made this happen.

if any one knows a fix it would be of great help.

thank you