Sorry, busy putting out other fires...
As I mentioned earlier - your problem appears to be classic RFI (radio freq interference) or EMI (electromech) related. Do you have any RF devices nearby your monitor (or the monitor's A/C power cord), such as a PC speakers, cellphone, cordless phone, florescent light, microwave, wifi, cordless mouse/keyboard, etc??? While viewing the problem, pich up move your monitor 1+ feet around in several directions and note ANY changes in the wavy gravy... Grab a small metal
cookie sheet and move the pan round the ENTIRE
monitor area - again note ANY change in your monitor wavy pic... If no change, get an long extension cord and (temp) plug in your monitor A/C power cord into a completely diff location (room).
Per my comment about "joke" app running, it is a long shot - but certain unknown or rogue programs can be running on the system w/o your direct knowledge or consent causing this problem. Run your Task Manager & sort your running program list (click Image Name) & view/compare the running processes... The processes can be compared against several references, among the more better known urls are..
From control panel right?? And about the joke in Task Manager! What should I be looking for?