Basically my monitor flashes grey (and a few reds, whites and other colors) every 4 seconds or so. The flash is up for millseconds. The monitors 1 year old and it's a iiyama Prolite E1900S (good piece of kit tbh)
What I've done:
Changed monitor cable - Nothing wrong with that.
System restores - didnt work
Cleaned inside PC
Rebooted PC several times
Changed resolutions
Sweated buckets
Sweared alot
Can someone please help me?