Computer was running fine but seemed a little slower. About a year ago I added an additional 64 GB RAM to the original 16GB, Upon checking this out the computer was only recognizing 16GB of ram. So I decided to reseat the 2 32 GB strips of RAM. Upon booting up both computer screens showed "no signal" errors. I checked the connections to the HDMI for the TV and reset it. But I also noticed a RED light flashing inside the window of the computer which I have never noticed that before. Not being well versed in computers I don't know if it is not booting up or if it is some other problem. Any ideas?? Thanks for the help