No posts are made, and the mobile CPU LED is behaving oddly.
No posts are made, and the mobile CPU LED is behaving oddly.
My machine suddenly stopped posting once. I've been operating it for about six months (the GPU is quite old, possibly a month after release). It hasn't been updated. The GPU was slightly undervolted to manage noise levels. I'm using a Noctua NH-L9i 17XX cooler with four diagnostic lights. When I press the power button (excluding one case), the CPU light flashes, then the RAM light turns on, followed by the GPU light red. Immediately after, the CPU light switches on as the RAM light turns off and fades out quickly—similar to a filament bulb dimming. The only oddity is that the CPU light remains lit when I disconnect the EPS cable. Previous troubleshooting steps: 1) Reset CMOS, verified cables and connections, reinserted RAM. CPU fan starts up, GPU light activates, no signals, then turns off after the sequence. 2) No GPU activation—CPU fan starts, VGA signal appears, then shuts down once the sequence ends. 3) No GPU turns on—CPU fan starts, VGA goes off after the sequence. 4) BIOS flashed to F6, F11, F20 via Q BIOS Plus (renamed file to gigabyte.bin) after each step, same outcome. 5) BIOS flashed to F6, F11, F20 via Q BIOS Plus with only CPU present (file renamed to gigabyte.bin) after each step, same result. 6) BIOS flashed to F6, F11, F20 via Q BIOS Plus with CPU/RAM installed (file renamed to gigabyte.bin) after flashing, same result. The exception occurs when I remove the EPS cable; then the CPU light stays illuminated. What bothers me is how the CPU light gradually fades instead of cutting out completely. I intend to bring it over to a different CPU tomorrow, but I'm curious about the problem. I've attached a video showing the full system switch-on behavior. My configuration includes an AMD 12700K on Gigabyte Aero DDR4 running 2x 3600MHz TeamGroup, 32GB RAM sticks, a Gigabyte Vision 3080 (10GB, no LHR), and a Sabrent 2TB PCIe Gen 4 SSD.
You're seeing red lights on the CPU, RAM, and VGA. Unless the hardware is faulty, verify if another power supply is causing the issue. Try booting with the integrated graphics by removing the 3080. After removing everything except the CPU, you should still be able to access BIOS. If that fails, it may point to the board, CPU (unlikely), or PSU. Inspect your PSU carefully—perhaps it was operating near full capacity with the 3080, and the 12V rails are now compromised. This could lead to instability at 5 and 3.3 volts, preventing proper operation. Check the PSU thoroughly.
Discussing coil whine or fan noise? It's a straightforward fan speed tweak—no undervolting required.
Tried without the GPU using the current 750W power supply and a 650W one from Corsair. Result hasn't changed. It feels like the CPU might be the issue after updating the BIOS.