While installing the DISK utility doesn't show the INTERNAL drives

[gstefler]

So I'am trying to instal Sierra on MY pc, but when i get to selecting the DRIVE it only shows the USB which i am installing from.
I have a ROG MAXIMUS VII RANGER(Z97) motherboard. My SATA setting is set to ACHI. PLease HELP me

 

[P1LGRIM]

Profiles need to contain at least your primary system to assist others with helping you