Speaker and power supply buzzing...

Hi,

 

I have just recently bought a new Dimension 5150. It was fine for a while but I have started to notice buzzing noises coming from the power supply and the speakers. The buzzing does not happen all the time but when it does it is really annoying. What can I do about it..?

 

I have tried emailing Dell, they emailed back, I replyed and they have never got back to me yet...

 

Is there an instant message service that Dell supply other than phone? If not how much is the Dell hotline/min?

 

 

Thanks in advance,

Josh