2 DIMM slots not recognized

I can fill the blue DIMM slots to capacity using the RAM recommended from the respective motherboard webpages with no stability issues, but as

Solved: After cable management not working 3,4 ram slots If I use them DRAM debug light up Before worked fine How do I fix it?

dimm slot not working laptop ram slot not working laptop ram slot repair

dimm slot DIMM physical id: 3 slot: ChannelB-DIMM1 How to check video memory size? 1 · Adding RAM was recognized by BIOS but not by Ubuntu · 1