Harman Kardon HK19.5 Computer Speakers "phone making buzzing noise" Questions

buzzing noise upon switching on with or without connection to pc Do you have a wireless phone near the speakers? It will make the speakers noisy. If this is true, move the speakers away from the phone

...buzzing noise when the volume is turned up.also when i plug in ear phones theres still no sound,any idea what the problem might be,i am not sure of the make of the speakers as i bought them second ...