RAM slots not working

CommanderYummy

Commendable
Aug 13, 2016
2
0
1,510
Yesterday I built my pc and when I was finished my pc wouldn't boot properly. The DRAM led was red so I decided to test the ram. Well long story short I can only get 2 out of the 4 slots to work. Ive tested both sticks and they work I just can't put them in their twin slots. When I put them in the slots that don't work the CPU led will sometimes turn red. My PC runs fine just the only problem is those 2 slots closest to the processor wont work. Any suggestions?

My specs:
CPU: i7 6700K
GPU: GTX 1080
Mobo: Asus Z170-A
RAM: Corsair Vengeance 16gb