asus motherboard ram slots not working - Dell R740 not recongizing memory module in slot A1 winner 888 slot

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Ram slots A1 and A2 not working, they worked before but then I took the PC apart and now they don't work anymore. The motherboard is MSI B250M Pro VDH B1 and B2 works just fine, I can enter windows and go on the internet and everything.

After SW update on Armory Crate one of the RAM slots is stuck on RGB and does not change regardless of the settings. I have tried to rotate the ram but it seems it's a Motherboard issue, cause problem does not move with RAM. What is the problem ?

The Asus Prime B450M-A motherboard supports up to a maximum of 64GB of DDR4 RAM spread across four memory slots.