High Pitched or Buzzing Sound in Windows XP

A high pitched or buzzing sound may occur when using the notebook PC.

This is normal behavior when the notebook PC is used in certain power configurations. Under certain power configurations the power supply capacitors in the notebook can resonate, producing an audible sound.

Reduce the sound by selecting a different power scheme.

You can adjust power configurations through Start > Control Panel > Power Options . Power saving schemes such as Portable/Laptop and Max Battery yield the best results.