After a couple of days of simmering. No. I am not. It was problem free Sunday and Monday. Should I reinstall windows? I have been meaning to move it to my SSD anyways. I have probably a little over 2TB of stuff problem is my 2TB External Drive may not suffice for EZ Transfer. Hmm.
Ok after flipping the cables I have determined it is not the cable. As I was eventually able to get the blinking again and not cables and HDMI are switched so it is a matter of video card. I think attempting on board graphics ports will be reasonable as that will determine if I need to refresh windows or it is a video card issue.
I just tried Xbox and played game, flipped through menus, etc and it didn't blink. So it is down to either the cable, video card or windows. I will try a different cable. I will switch xbox cable to PC and PC to xbox and test both.