No sound on HP Envy 32 via mini DisplayPort to DisplayPort cable on Mac mini

I recently bought an HP Envy 32 monitor and hooked it up to my Mac mini using a mini DisplayPort (i.e. Thunderbolt) to DisplayPort cable. The video works fine @ 2560x1440, but I have no sound. The sound output in system preferences mentions "The selected device has no output controls" for the Envy 32. The sound works fine when I use an HDMI cable, but then the resolution is limited to 1080p. The Mac mini is a mid 2011 model, which is capable of transferring audio via DisplayPort, as far aas I know. Any suggestion on how to solve this?

you should try mirroring your screen on the Vizio HDTV
this link will help you how to do this
http://www.ehow.com/how_5661153_set-display-macbook-mirror.html

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