ram slot on motherboard not working

AMBIL SEKARANG

‎Which RAM slot to use for an additional stick | DELL Technologies

Whether or not it matters which slot you install your RAM depends on your motherboard and the number of RAM sticks you have.

How To Fix VGA Lights on Motherboard - TechColleague

You're probably wondering what to do if the VGA light on the motherboard isn't working. You're not the only one who feels this way. This is a typical problem

Can I mix Ram Sizes? - Page 2 - Windows 10 Forums

Though the PC is running with both RAM sticks on A1 and A2 slots, I fear it can damage CPU when doing heavy works, since one optimized RAM slot (B2) is not working.

Why Won't PC Boot with 2 RAM Sticks (But Works with 1)? - CPUs ...

Then I tried to boot again with RAM in slots 2 & 4, not working, tried again slots 1 & 3, working. Then I borrowed another 2 & 16 GB DDR5 RAM, also 6000MHZ from my brother, plugged them in the 2 & 4 slots, not booting again.