The problem is that A1 and A2 memory slots are not working at all. I have 2x8GB kit, but it works only in B1 and B2 slots. I've been looking all over the internet and found out that there could be a problem with processor.
I tried different setups A1-A2, A1-B1, A1-B2, A2-B1, A2-B2. Even used only one card: on A1 and A2 - not working, B1 and B2 - worked.
Can you help me ? What could be a problem?