2008 Mercury Mountaineer #- Won't start

i have a 2008 Mercury Mountaineer that won’t start and has no dash lights . Door locks work, windows, radio all work but will not start almost like there is no power from the ignition to the engine need some ideas please, have checked all fuses and relays and they are good.

Does it crank ok? That rrr rrr rrr sound w/key in “start”?

A bad BCM can cause that problem.