If you can boot with one processor, but get 1-5-4-2 with two, something's killing your 12V rail. Make sure you've got the 2x4 CPU power connector fully seated, and just run with a single DIMM to start with.
weel I send the board back to the store, and they send it to Intel.
Intel send me an new 5520SC and now the system runs weel.
Thanks for your reply.