What does the code "C0" (reserved) mean?

Apr 6, 2018
1
0
10
So I just built a new Computer with the components:

-i7-7700K (Stock)
-GTX 1050ti
-32GB DDR4 Ram
-1TB Seagate HDD
-Corsair RM750x
-Z270X Gaming 7 MoBo
-H100i v2
-Corsair 450D

Basically when I start up the Computer it looks fine, all the LED's work. But after 1 minute it switches from A0 to C0. And my Monitor stays black the whole time. I have looked at the CPU pins, they were all fine, My cables are fine. The only thing is this C0 (Reserved code) that bothers me. I bought the components for 1400$+. An answer would be really appreciated. :)