Hi all, My HP Pavilion laptop has started making a whining noise through the speakers. It is most annoying when the CPU fan starts spinning, but I can also hear it when the CPU fan is off, the difference is the noise is intermittent, maybe when the hard drive arm moves to read something or when the RAM is written to. I know it's coming from the speakers because I can mute them, thereby suppressing any whining noise.
What is this? Is it electrical interference? How can I get rid of it?