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I just completed my first PC build. It includes an AORUS B450 Elite V2, Ryzen 5 5600X, RTX 2060, 250GB WD Black M.2, a crucial 1TB SSD, a Corsair 850W PSU, and two DDR4 8GB sticks from Corsair Vengeance. After assembling it, I powered it on and noticed two flashing red lights between the CPU and RAM. I tried reseating the RAM and moving it around, but the problem persists. The issue seems to be related to needing a BIOS update for the board—was that correct?
It seems likely the B450 includes Zen3 compatible BIOS by default. Also, it appears the board likely needs a supported CPU to function properly.
BIOS update seems likely for your B450 model, but verify the board maker's compatibility guide for the RAM you use. RAM can make a big difference with Ryzens. My 5900X caused problems for months until @BiotechBen mentioned RAM training, which clarified the issue was indeed the RAM.
Speed isn't the main focus; the part number matters most. Certain boards react differently to specific RAM, and some processors behave similarly. @Linusboss look up your RAM's part # (SKU) in that list. Updated February 28, 2023 by An0maly_76 Added more details
It could happen sometimes. RAM might function even if it isn't explicitly marked as compatible. I suggest starting with a BIOS update. I checked the CPU compatibility details for that board and found that support for your CPU was included in BIOS version F61.
@Linusboss shared what @Monsterkater mentioned. Being out of the list doesn't rule it out, but it also doesn't confirm it's possible. I've noticed this tends to happen with various board/CPU setups. My 5900X caused me a lot of trouble for about five months until @BiotechBen discussed memory training, which helped me get back on track. A BIOS update typically needs an older supported processor unless the board includes a dedicated USB port for updates. Updated February 28, 2023 by An0maly_76 Added more details
It should be possible to refresh the BIOS even without a chip in the socket. The maker’s site provides instructions for this process. Still, I think this is likely another instance of Corsair Vengeance RAM versus Ryzen again. There are many confirmed reports showing similar issues elsewhere, making it hard to ignore.