Asus X99 deluxe B1 B2 mem slots not working

[TheDaveP]

After replacing a faulty CPU Fan, the system can’t recognise Memory slots B1 B2 no matter which sticks I put there. All the Sticks were working fine up that moment, showing 64GB. Now I get only 48GB.

Tried to reset to defaults with no luck.

Any Ideas?

 

[Tradesman1]

What cooler, regardless, you may have overtightened in a corner or side which can throw the MC (memory controller) off, try loosening the cooler then snug it back down screw tight 😉