how old is your monitor ? what kind of monitor do you have ? Most monitors that are fuzzy are usually old and are in need of adjustment or replacement . The fuzzy is usually caused by the focus control needing to be reset to factory specs. this is " NOT " something you should attemt unless you know what you are doing ..it can lead to an electical shock DO NOT ATTEMPT TO DO THIS ..
speakers to close will give you a lot of funny colors every where
but wont cause a flicker. that can be refresh rate ! refresh rate can cause a lot of different things to happen , like rolling screen , dual screen , and a load of other things