Monitor's weird issue

[Yoola]

Besides my S2417DG I have secondary LG 22EA63 screen, which is giving me some headaches now. 

Last night when I turned off my PC and went to bed I saw some flashing later on. Monitor was "panicking" and switching between "LOOKING FOR SIGNAL" to "GOING IN STANDBY MODE SHORTLY". I didn't think anything major was going on so I just completely flipped the power switch on the power outlet. In the morning monitor started doing same when turned on. It'd just randomly put out image and then turn off, in cycle. 

 

I've tried:

+Replugging monitor in another power outlet

+Restoring factory defaults in settings on the monitor

+DDU & clean driver install

+Adding DVI-D->HDMI adapter to eliminate bad HDMI port going bad on GPU

 

 

Anyone has any idea what might be wrong?