I've got a dual monitor system - Intel I5, Nvidia Geforce GTX960...

Anyways, for some reason, here and there when I sit in front of my machine in the morning and wiggle my mouse, my main monitor does not come back to life. I should mention, that the main monitor on this machine also serves as the secondary monitor for my work laptop, which is frequently plugged into it. Typically, if I have both machines plugged into it, there is a button I can press on the monitor which will switch between inputs. Trouble is, I sometimes can't get any picture on my main machine, until I power off the computer with the 7 second salute and turn it back on.

The main computer with the problem is connected to this monitor with display port.

Any advice appreciated!