A red light on the motherboard usually indicates a hardware issue. It can signal problems with the CPU, RAM, GPU, or power supply depending on its location. Many motherboards have labeled LEDs to show which component is failing. Check connections, reseat hardware, and consult your motherboard manual to identify and resolve the specific problem.
A red LED on the motherboard is more the likely an indication of a hardware problem. It might be the CPU, memory, graphics card or power supply. Most motherboards have marked LEDs which help point out the area of trouble. The precise meanings may be found in the motherboard manual.
