MSI PRO B850M-A with Ryzen 9 9950X Red + Orange LED ON

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Robot5

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CPU: Ryzen 9 9950X
Mobo: MSI PRO B850M-A
RAM: LEXAR THOR OC 2x16GB 6000 MT/s (also tried GSkill Flare 2x32GB) DDR5
GPU: RTX 5060 Ti 16GB

I recently built and then quickly replaced the CPU from a ryzen 9600X to a ryzen 9950X(decided to upgrade after completing the build) for a work computer. I returned the 9600X, but when it was running it did run with all 4 ram slots taken up. With the 9950X I can only use A2 to boot to windows, I've tried all the other slots on single channel and they don't work.

I've already updated to the latest bios. I've tried speeds of 3600, 4800, 6000 on expo and standard profiles.

Only thing left to do is check open up the mobo and check for bent pins
 
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Yes, check for bent pins, also see here and the following posts. While they are technically all bent, the tips of the pins have to line up in a perfect pattern, with none visually sticking out from the rest. So if you have some pins that don't look like the others, then you really have some bent pins. Ideally take some photos of the socket, upload to an imagehoster and link them here, even if you don't think there are bent pins (sometimes they are not that easy to spot for the untrained eye).

Four modules run especially bad on AM5, also see RAM explained: Why two modules are better than four / single- vs. dual-rank / stability testing. Any total RAM capacity you want, with DDR5, try to reach it with two modules only. For daily use including gaming, you'd have more than enough RAM if you only use 2x 16 GB in slots A2 and B2, which is the optimal configuration for most people with DDR5. For professional workloads, which your 9950X could suggest (otherwise why would you get that CPU model), you might need more RAM, it depends. But of course, if the slots don't work, something might be wrong with the pins in the socket, or the CPU itself.
 
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it was a bent pin unfortunately. the pin is completely bent the other way so i don't think i can even bend it back and pray it works.
 
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Take a few photos and upload them to an image hoster. The main thing is to not bend it more than absolutely necessary, because you want to avoid causing metal fatigue and the pin breaking off. But depending on the position of the pin, if you work carefully and precisely, you can bend it back over itself. The pin doesn't even have to look perfect afterwards, only the position of the golden tip is important, that it lines up well with the others again.
 
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