a couple weeks ago we got our computer cleaned and got everything ereased. since we have gotten it back we cant figure out how to get sound to come out of the speakers. as far as i can tell everything is wired up correctly, when you disconnect and reconnect the speakers from the audio jack ou can hear the speakers are on but if i was to watch a video i dont get any sound. i installed soundblaster and that didnt do anything, and yes i did check to make sure the mute was off. any ideas whats going on??