Power but no POST. CPU or motherboard?

[viivo]

8700K
MSI Z370 Gaming M7

Happened out of nowhere yesterday, board lights up and powers headers but no video - integrated or discrete - and displays 00 (not D0) and the DRAM debug LED is lit despite memory testing fine in other systems and trying all slots and combinations on this board. I spent 20 minutes checking the socket pins but couldn't find anything wrong. Cleared CMOS many times.

The CPU has run stock and with good cooling. It has to be the board right?

 

[kirbyrj]

Yeah, I would suspect the board.

 

[viivo]

Got a new board and was horrified when it also failed to boot. Found out it's because now two of my DIMMs are dead. Can a motherboard take memory out with it when the RAM slots die?