Update your BIOS to the latest, which is 3.60 as of 4/16.
You cannot get better advice than from Dan-WGBU. He is a high level HP engineer, has been helpful here for years now, and has access to internal HP documentation and engineering that would not be available from any other source.
Your boot block date documents that you have a "Version 2" motherboard.... it is 11/10/09, not from January 2009.
My guess is that you have a bad second processor. I'd recommend trying that second processor in a single processor configuration, with it being in socket 0. See if that works, and if it does then try your known-good original processor in socket 1 (the second socket).