HElpppppppppp

No any electrical thing near to my monitor but a speaker is there, but
i think that speaker never cause this problem becoz from last three
year i putting them in same position....there lan wire near to monitor
,it causes any flicker ?.................my cpu & monitor are 1 feet
far,due to that reason any problem?..........i dont knw what is
happnnig.........i have done all simple try....