Ur sound card might have gone bad sure99.
Here are the specs of ur sound considering it is a pavilion 8860.
3-D Stereo, PCI, 16-bit Sound
Crystal sound chip on motherboard
Is the sound not working at all. Are u getting windows default sound? Try to check the volume from control panel.
One disk to rule them all,
One disk to bind them,
One disk to hold the files
And in the darkness grind \'em.