I have an issue where I have two monitors already plugged into my GPU, and when I try to connect my third one, the screens adjust so the one I plugged in turns on, but doing so the middle one turns off. It's like my system only allows for 2 monitors to be connected for some reason. All of the cables work, all of the monitors work, and I haven't experienced any issues with my GPU (it's fairly new). I have had 3 monitors working for a while and this started happening recently.