a few hours ago I started hearing a sort of sizzling sound and then noticed smoke coming from my power supply.I think the ps fan died and it overheatedsoi immediatly shut the pc down and opened the PS up. there was a good amount of dust buildup and im not sure if the sound was from the dust or the PS itself. when I tested the PS i flipped the switch to on (power supply on but pc is still off) and heard a humming sound that never happened before. I switch to a secnd PS I had and heard the same humming from the PS. Is there somthing wrong with my other components now. or is this harmless capacitor humming on both the PS? and why is it humming now when it did not before? any help would be much appreciated.