Xbox One works fine on monitor, but PS4 and PC display no signal. Any help?

[BoxInTheJack]

The title is pretty self explanatory. But basically, my PC and PS4 worked fine a couple hours ago on the monitor. Now, it just displays "no signal." I tried an Xbox One, which worked. I also used the PS4 on a TV, and that worked. However, I really want to use the monitor. Any help is GREATLY appreciated, thanks.

 

[sethwilliam]

What cable are you using to connect each device? The same cable or a different one, HDMI?

 

[Rhinofart]

What are the refresh settings on the monitor? Shouldn't matter, but you never know.