I upgraded my Dell M1330 to Windows 7 from Vista. I have no sound at all from my laptop speakers. I've checked all of the usual things, driver updates, windows updates, etc. Nothing works and everything is up to date. The speakers aren't muted. When i look at the device manager, the only options I can see are for headphone and RCA jacks. I can't seem to find the integrated laptop speakers. Can anyone help point me in the right direction??