Shrill Sound on my Klipsch Promedial speakers

[cosmoo]

My Klipsch Promedial 2.1 speakers just started making a loud shrill sound when I turn on the unit. Does anyone know what would cause this and how to get rid of it.
Thanks, C.

 

[buwish]

This topic has been moved from the section Forum Feedback to section Home Audio by Buwish