Hi i have hp pavilion DV 7 when i plug to tv i cant find the hdmi connection to my computer help

hi 
i i have hp pavilioondv 7-1428ca,when i bought this the hdmi worked in my tv but after format and then installed the window 7 now i have no sound when i plung my hdmi cable to tv,
even it not showing to my sound menu.please helpme how to fix this problem.
i went to control panel from there i also try but no luck

Desperate times call for desperate measures:
System Preferences > Network > Ethernet > (Assist Me) > Assistant ...
... and set it up again, being sure to specify a new "Location". Do not keep the "Automatic" one, create a new one or accept the default (current date&time).
A "Location" is a basket of settings from all over the place that could influence how your network connection behaves. Thye were invented to collect together such stuff so that you could switch fro "Home" to "Work" to "StarBux" just by specifying the Location, and all the settings needed would be pulled together and applied at once.
Sometimes a stray setting gets included by accident, and a new setup eliminates that stray setting and it perks up and works afterward.

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