I'm troubleshooting a brand-new PC that has failed this way since its first startup. The system uses an ASUS TUF Gaming X870-PRO WIFI7 W NEO motherboard, Ryzen 7 9800X3D processor, 32GB Corsair Vengeance DDR5-6000 memory, Samsung 990 PRO 2TB PCIe 4.0 SSD, and an ASUS Prime RTX 5070 Ti.
Whenever the PC is fully powered off, the next startup produces a solid yellow-green motherboard diagnostic LED. The monitor detects an attempted signal but remains black, and the system does not POST. Clearing the CMOS allows it to boot again, but the BIOS settings have to be configured repeatedly. The settings are being saved correctly, and replacing the CMOS battery did not help. Has anyone encountered this behavior, and what would be a permanent fix?
3 Answers
That LED corresponds to the motherboard’s DRAM status, so this sounds more like memory training or memory compatibility than a graphics-card problem. Update the motherboard BIOS, then test with EXPO disabled and the RAM at its default speed. Also try booting with one DIMM at a time in the recommended slot, and reseat both modules. DDR5-6000 can require updated firmware or manual tuning on a new AM5 system.
Ignore the generic AI diagnosis and use the motherboard manual’s diagnostic LED table. Since the indicator is the yellow-green DRAM light, focus on RAM seating, DIMM slots, BIOS maturity, and memory training. If the latest stable BIOS and a single memory stick at default settings still produce the same failure, the motherboard or memory kit may be defective and should be tested or replaced under warranty.
A CMOS reset should not be required after every shutdown. If the board loses settings only after power is removed, check that the BIOS is actually saving changes and that the system is not restoring defaults after a failed memory-training attempt. Load BIOS defaults, leave overclocking and EXPO off, save, and perform several cold boots. If it still fails, check the board’s memory support list and consider testing a different known-compatible kit.
The system uses the RTX 5070 Ti in the PCIe slot, not integrated graphics. I’ll test the memory at default settings and check the BIOS version, since clearing CMOS is currently the only way to get it to start.