Pioneer A-205 faint noise/hiss issue

[GraphicMan]

as the title says, i noticed a faint noise/hiss when there is nothing playing that i dont think i have had with this unit before ever, i have not changed its location
what makes it more weird, this noise is gone almost completely if my hand gets within 5cm or less close to it (close to the panel)!!
out of curiosity what does that mean?
thanks

[GraphicMan]

it turned out that the cause of the noise is from the pc and not the amplifier