I have dual monitors, one is connected via HDMI, the other via DVI. Sometimes when I turn on my computer the monitor connected via HDMI says "display not connected check signal cable". Trying to detect it through windows or CCC does nothing. The second monitor that is connected through DVI works fine. The only way to get the monitor thats connected through HDMI to work is to connect it through DVI, then its instantly detected. I am not sure whats causing this to happen, the HDMI cable is brand new and works fine when testing on my cable box.