No sound on 2 of my macbook pros

[p90xfit]

I have a 2011 macbook pro and a 2010 macbook pro with with lion and the other with snow leopard, I set everything up and I can get video, but no sound. I went to the settings and sound but there is no option to change the sound output, any help would be great as I paid a lot of cash for this, and can not return it since its past the return date, and as of now it's useless.

[p90xfit]

thanks for all the help!! Will defiantly recommend this product to every one I know! :cool:

[ChristianP]

Which DisplayLink adapter are you using?

[new2mac]

using 1.8a driver. Perfect video, no blasted audio. Using hdmi cable. Any suggestion/help is appreciated!

[new2mac]

Posted earlier but since been pulled, trying to pass along again.

1: sys pref/sound/output/select "connected device".

2: Reboot

3: go back to sys pref/sound/output/ and WUSB audio/Video device may or may not show. If it does, select it, my audio came active.

Good luck

[amilcruise]

Thanks new2mac! That works!

To all,
I've tried everything I read from the web before, but mine just work when I reboot my macbook pro while the sys pref->sound->output window is open and in the front. Not sure why it needs to be like that but it works for me! :) Also, the usb device is connected while Im rebooting.