Distorted MegaWorks 510D speakers

My MegaWorks 510D speakers have become horribly distorted. I know that it's
not related to my computer, sound card, operating system or software because
I get the same level of distortion when I feed an analog signal through the
AUX port with the speakers completely disconnected from the computer, as I
do when they're connected to the computer via the Digital-In port. This
looks like a problem with the speakers, not my PC. Has anyone had this
happen with these speakers, and is there a relatively cheap and simple
solution? They're out of warranty and I'm not sure it pays to have them
fixed by Creative.

Kovie