Buzzing sound through the speakers effecting all input components

The buzz is probably caused by bad earthing,

1. • If the earth return is through screws holding the printed circuit board to the case.
     Take out any screw that goes through a metal connector on the circuit board. Clean the screw with a wire brush, clean the connection point on the circuit board and where the screw goes into the case.
     Before you put the screws back squirt some wd40 or or put some vaselene on them and tighten them, it will help stop the dust from making a bad contact.
     

Hello

The buzzing sound that you have mentioned may be due to following reasons.

• The power supply may be internally producing spark or power lines are damaged.
  

• There may be some connector which is not connected properly. Check the connectors which connect the speakers to the audio system.
• Any of the connector may be damaged. Again check the connectors.
• Check your power supply.There may be some sparking or adapter not connected properly.
• If these are not your solution then your connectors are damaged internally.