hi, first post....i dont know much about computers but im having trouble with my sound. I have a Dell Dimension E310...and the speakers that came with it. I dont have any clue what could have caused this but i have no sound. Ive done all the trouble shooters and still no sound. I had a yellow exclamation mark by the SigmaTel High Def CODEC in device manager...so i uninstalled it and installed it and it says its working fine. But i still have no sound. I open the volume control and it wont let me click on anything...and when i click on audio output in speech prop. and it says there are no current audio output devices installed on the machine. help!!