POST fails. Memory error

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   Cannot complete POST. CPU LED is solid and RAM LED is flashing. This is a new build. Everything worked fine for about 1 day. Windows 10 came up, I played Rainbow 6 Siege for a short amount of time, browsed the internet, etc. I turned machine off for about 4 hours and problem appeared when I tried to restart. 

To troubleshoot, I have tried the following:
1.     Removing one stick of RAM (I started with 2). Tried restarting with only one stick in B2 slot. Result:  no change.
2.     Removing CMOS battery for 2 minutes. Result:  no change.
3.     Using Flashback mechanism to reflash BIOS. Tried reflashing with latest version 3.01 Result:  no change.
4.     Using Flashback mechanism to reflash BIOS. Tried reflashing with v2.02. Result:  no change.
5.     Disconnect external GPU card. Result:  no change

Any other ideas?

Config
*ASRock X670E Steel Legend ATX AM5 Motherboard
*AMD Ryzen 9 7950X3D 4.2 GHz 16-Core Processor
*CORSAIR Vengeance 64GB (2 x 32GB) 288-Pin PC RAM DDR5 6000 (PC5 48000) 
*Asus TUF GAMING OC GeForce RTX 4090 24 GB Video?Card
*Western Digital Black SN850X 2 TB M.2-2280 PCIe 4.0 X4 NVME Solid?State?Drive

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dantebox Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 03 Jun 2024 Status: Offline Points: 20	Post Options Post Reply Quote dantebox Report Post Thanks(0) Quote Reply Topic: POST fails. Memory error Posted: 03 Jun 2024 at 4:12pm
	Cannot complete POST. CPU LED is solid and RAM LED is flashing. This is a new build. Everything worked fine for about 1 day. Windows 10 came up, I played Rainbow 6 Siege for a short amount of time, browsed the internet, etc. I turned machine off for about 4 hours and problem appeared when I tried to restart. To troubleshoot, I have tried the following: 1. Removing one stick of RAM (I started with 2). Tried restarting with only one stick in B2 slot. Result: no change. 2. Removing CMOS battery for 2 minutes. Result: no change. 3. Using Flashback mechanism to reflash BIOS. Tried reflashing with latest version 3.01 Result: no change. 4. Using Flashback mechanism to reflash BIOS. Tried reflashing with v2.02. Result: no change. 5. Disconnect external GPU card. Result: no change Any other ideas? Config ASRock X670E Steel Legend ATX AM5 Motherboard AMD Ryzen 9 7950X3D 4.2 GHz 16-Core Processor CORSAIR Vengeance 64GB (2 x 32GB) 288-Pin PC RAM DDR5 6000 (PC5 48000) Asus TUF GAMING OC GeForce RTX 4090 24 GB Video?Card *Western Digital Black SN850X 2 TB M.2-2280 PCIe 4.0 X4 NVME Solid?State?Drive

johnukguy Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Jun 2024 Location: USA Status: Offline Points: 120	Post Options Post Reply Quote johnukguy Report Post Thanks(0) Quote Reply Posted: 07 Jun 2024 at 7:04am
	Reset the CMOS using the jumpers on the board. Then try a single stick in other slots, not only the B2 one.

johnukguy Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Jun 2024 Location: USA Status: Offline Points: 120	Post Options Post Reply Quote johnukguy Report Post Thanks(0) Quote Reply Posted: 07 Jun 2024 at 7:09am
	Also, once you are in the BIOS, do not leave it at default settings as it is unlikely to post. Set XMP and secure boot, disable CSM and so on.