Single Ram Stick Breaks PC

[Scamss]

I made a post about this recently, and I have been trying to see if I can fix it. I have a, Strix B450F. Ryzen 5 5600x, currently 24GB of ram (usually 32GB). I have an RTX 3060, 850W Corsair PSU. The pc has been running fine since I built it about a year ago at this point maybe more. I always had a weird issue where it would freeze and i would need to restart the pc if the pc was shaken. Was never really a problem. Only really had it happen a handful of times. But this past time has been causing issues. I finally got the PC to post now, but only 3 of the 4 RAM sticks work. The single ram stick that isn't working in mine. I put it in my brothers pc and it works just fine. The ram is the same as the other 3  in my pc. This has never been a problem. I don't know why it would work in my brothers pc just fine, but not work in mine. He has a B550, 3600, and a rx 6700 pretty sure, 750W psu. I have nothing overclocked, all my drivers are up to date. I haven't done a BIOS update, but I don't think that's even the problem? I did buy them as sets of 2. I had 16GB, then a few months later I bought 2 more sticks for 32GB. But this was awhile ago. And never had a problem. Any idea on what I could do? 

 

EDIT: To clarify if I put this ram stick in, it causes an error for my motherboard and the MOBO puts a Orange light up indicating there's an issue with the RAM. And the Pc won't post, taking it out the PC works fine.