|What is your motherboard make and model ?|
Some motherboards have LED lights on them for CPU, RAM, GFX card, and boot device.
If a LED is continuously shining red ( could be orange ) near a component, then that means there is a problem with that component.
If yours is like this and LED is shining red/orange near the CPU, then you should check the installation of CPU and/or its power connection.
Hope this helps.