Asus with 2 bad memory slots, TWICE?!?

[ArtofRetouching]

New Build with 4 memory slots. I can install memory into B1 and B2 no problem. But A1 and A2 both hang on Error Code AC, and ultimately stop at Error Code 55. The 4 sticks are fine, and 2 slots are fine.

The TWIST, is that I exchanged the motherboard for same model. Shocked to find I have the same exact problem. A1 and A2 will not accept memory sticks. No overclocking, I just unboxed and tried to power on, met with failure both times. Any ideas?

Asus Code Z270 and G.SKILL Aegis 64GB (4 x 16GB) 288-Pin DDR4 SDRAM DDR4 2133 (PC4 17000) Model F4-2133C15Q-64GIS

 

[alexoiu]

I'd RMA the CPU too, in this case. Try also testing the board outside the case, to rule out a short.

 

[ArtofRetouching]

I had previously run it a few days without a case (that took longer to arrive). I can say I didnt have "these" issues, so it's worth trying again.

But I was already looking to throw it out the window for other reasons. Like constant crashing. Its hasn't done that while in the case. But Ill try the suggestion.

 

[ArtofRetouching]

I placed rubber grommets on the back of the board, to separate it from the metal nut. I picked them up at the hardware store in the plumbing department. Problem went away instantly.

 

[alexoiu]

First time I've heard it,
Maybe some case components did short the board, and the grommets raised a bit the board.