I had to unplug my speakers to my computer. When I plugged them back in, they didn't work anymore.. the light still goes on to show they have power, but they don't play sound. When I go to the control panel to try to adjust speaker settings, it says there are no speakers - but there clearly are, and I didn't change anything except that I unplugged them and plugged them back in. Gah. Anyone know how I can get my computer to realize I have speakers again? Thanks..