I think you have it covered, 
Another thing I can think of, as I see you have several devices connected, is disconnecting as many as possible, those you don't need to play. For example, a webcam, second monitor, controllers, etc. Leave the basics - a keyboard, mouse and monitor, then turn on your computer and give it another try.
It's not likely to be the cause but doesn't harm to give it a try, considering you have the basics performed already.
Thanks,
-Mai