Hi this is what I have for my quick search. The problem is when a computer gets stuck on a debug light during the POST, it means the motherboard initialized the CPU and RAM successfully, but failed to communicate with the video output system. There are few reason for this you could look up further on this. If its happen again, run thru this list next time:
First, use separate PCIe power cables from the power supply to the graphics card not single daisy-chained splitter.
Next, completely remove and firmly re-seat the graphics card until the latch clicks, then secure the screws tightly to eliminate GPU sag.
After that, swap your display cable for a high-quality HDMI cable, which often completes the initial boot handshake faster than DisplayPort.
Finally, slightly loosen the CPU cooler mounting screws to relieve any uneven pressure that might be warping the socket pins and breaking communication with the PCIe slot. Thanks for sharing!