Can someone please help!!! me i have a HP Pavilion dv6636nr laptop and no sound

i have a  HP Pavilion dv6636nr laptop and were my sound icon is located it  has a (x) on it and it says no audio output device is installed I've tried everything i download the audio driver from hp ssoftwear & downloads and i get a error msg that  reads driver installation failed :could not find the device for this driver can someone pleaseeeessss!!!!!!!!!!!!!!!! help

someonehelpmaddy wrote:
My Mac knows that it is connected to the montior...
Open your Displays system preferences.  Is there an Arrangement tab and does it show two screens?  If no Arrangement tab then your mac does not know it has two screens.  Maybe smc and pram reset will shake it free and maybe not.  Maybe there's something wrong with the connection.  Thunderbolt plugs are similar to mini-displayport plugs so make sure the plug is pushed firmly in so that essentially all the metal part disappears inside the socket.  The plugs can be a little tricky in that you need to make sure the plug is fully seated in their socket.
If you do see two screens in the Arrangement tab then click Detect Displays and Gather Windows to get the Displays preferences of the other monitor on to your main monitor.  Check the resolution and if there is a refresh rate check that as well.

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