No sound on brand new Acer Aspire 5920

[Envergure]

When Vista started for the very first time it played its little sound, but since that i haven't heard a peep from it. No idea why. Any ideas?

Device Manager says everyhing is working fine.

 

[Ultiweap]

Check in windows sound manager if everything is ok. As example if the sound is on or enough volume selected or it has not been muted.

 

[Envergure]

OK, it works now. I went into "Acer Sound Manager" or whatever in Control Panel, and turned everything on all the way. That didn't work, but when i closed the lid it fed back (mic above the display) and since then it's worked (although sometimes individual apps clam up).

Then i turned of the thing where it outputs the mic's input to make it not feed back,