usually when the ram is also an issue it will blink the yellow light as well. red light is for cpu yellow is for ram.
example when I did this switch I was getting a cycle between the red and yellow, red cpu was solved by updating to the most current version of bios and yellow was because of the specific ram brand my mobo just didnt like the teamgroup tforce ram. It was also because my mobo recommends only up to 3200mhz and I was trying 3600mhz and didnt work, but currently have a 4000mhz g skill in there.
so that could be an issue too if your using a higher ram speed than what is recommended, which can be a hit or miss with brands/speeds and pc stability
So if you dont have a yellow blinking light as well then maybe try reseating your ram. How many GB and how many sticks do you have? If you have only 2 use the second and fourth slot starting from left.