Having an odd problem with my system's display?

A while back I had posted about a lack of signal after using my PS4 Silm on a tv. When I switched back to the monitor, I had no signal. Now, after resetting the resolution it worked fine. However, after leaving it in rest for a few weeks, I've got the same problem again. It still displays when plugged in to a TV, however once I switch back again I can't get it to show anything.

All the components are working fine; I can use the HDMI port on my monitor for other stuff, and all the cables work. I tried switching it back to 1080p again, which worked last time, but not this time.

I'm not sure what's up. Is there something with my ps4 that makes it not recognize my monitor? The fact that this issue came back after it was in rest mode seems weird too.

Any advice would be appreciated!