solved ( imho)
changed the cooler with stock and same thing
changed the processor , fan and temp ok
since mobo did not feel very hot touching, It seems a temp reporting problem with the amd x2 5600+ . i am sending it for service
i just want to know may a problem like that appear only 1 hour of use , and take into account that this same processor(5600) worked flawless for at least a year.