I have a similar setup but the machine does not POST or get to the BIOS screen.
My setup is a z800 with a1100W PS...Motherboard with AS#460838-003.... Boot block date of 11/10/09 and
intel xeon 5667 3.06/12M/6.40 CPUs.
I updated the BIOS version from 3.07 to 3.57 and the machine still does not get POST. If I only run 1 CPU it works fine.
I took the other CPU out of an Identical z800. I tested each processor and they only work individually. These are factory installed CPUs and they won't work together.
Does anyone have any insight?
Thanks in advance!