The RAM you put in I see is 1600Mhz?
so you have a 2600Mhz Ram module somewhere
It might be that the RAM modules isn't giving the correct power to
help the M/B boot up
The Thing is Asus runs Realtek onboard chips.. so you wil get the standard Onboard 7.1 EXP.
witch isn't bad for realtek delivers good sound on asus.. I don't have the same board but do have the same chip
on my ASUS motherboard