RAM slots 3 and 4 not working: Faulty motherboard? : buildapc
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DDR4 ram won't fit into DDR4 motherboard ?! - CPUs, Motherboards, and Memory - Linus Tech Tips
SOLVED> Mint is not detecting new memory (RAM) - Linux Mint Forums
How to fix a RAM slot on a PC motherboard that doesn't recognize RAM sticks - Quora
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Can I plug a DDR3 RAM stick into a DDR4 motherboard socket? - Quora
SOLVED: Bank 1 Memory Slot not recognizing RAM--easy way to fix? - MacBook Pro 13" Unibody Mid 2009 - iFixit