Windows 10: Weird issue with Acer CB280HK 4k Monitor

So, I was lucky enough to get a new monitor and new pc the other day; a dell xps 8700, and for purposes of this discussion, the video card set up is a intel hd graphics 4600 board, and a Nvidia GTX745, with 4 gigs of ram. The monitor is a 4k capable monitor, and to get the full res, its plugged in via a display port connector, into the intel board, since the nvidia card does NOT have a display port connector, only hdmi, which would limit the res to 1920x1080.
Anyways, the monitor is fantastic, and things are so clear and bright it blows my mind!
Problem is, ever since connecting it, for some crazy reason, I can NOT get my control panel to open, my file explorer to open, or adjust some of my desktop properties...EVERYTHING else works great, but those things no longer work..
Weird thing is, if I downres to 1920x1080, I can get the file explorer to work, but thats about it..
I ended up downloading MulitCommander Pro, which is an alternative file manager, and it works just fine.
I am on windows version 10547, Home version..

All these things worked perfectly with my old monitor, connected via hdmi@1920x1080, so I dont think anything serious is wrong, but I cant figure out why these built in windows core items wont open up when the res is at 3840X2160.
Hopefully, a new insiders version might help. but otherwise I am stumped.

Thanks for any help that you can offer!

:)

 

Dual Monitors Suddenly Stopped Working

OK, I figured it out a few hours after posting this. My 1st monitor was set to a 60 Hz refresh rate and apparently this Lenovo can't run a 2nd 4K monitor if the first is set to 60 Hz. Switching it to 30 Hz fixed the problem. Why this popped up after 8
months, I don't know. Weird.

 

Windows 10 Feature update (11/4/17) - computer cant boot

got it working. Pretty easy using the recovery tools. Still - sucks I had to go through those extra steps

https://support.microsoft.com/en-us/help/12415/windows-10-recovery-options

Edit: Actually, that was not the problem. When I hooked up my PC to the 2 monitors it again did not work. I have a 1080p and a 4K monitor. When I disconnected the 4k monitor it started. So it does start, it just goes blank with a 4k monitor. If I replace
my 4k with a 1080p monitor, then both 1080p monitors works. Replace the one back with 4k monitor, computer goes blank.

Now - this was working right before the update, so it is unlikely it is a hardware issue, rather a driver issue related to the update

Somewhat sucks