No Sound after unplugging HDMI cable

Hi, 

Firstly i using "LG" Television 32' , when i plug HDMI cable and start my PC the sound work fine :D ... but when i remove HDMI cable and plug for example (PlayStation 4) and remove it from (PlayStation 4) and plug HDMI to PC the problem coming , There is no sound ! what i do for sound back ... i restart PC and sound back that's ok ! but it's annoying every time i must restart !!!

please help me this problem face me since 6 months no solution's

"WARNING" 

•I have try change many TV's its same problem

•This problem coming after my AMD card stop working and give me black screen , And now i am using Intel video card (external card)

•I have tired install drives

•I tired manage devices trick 

•I have change HDMI cable many times

"PC INFO"

PC : Dell XPS 8700

System: Windows 7 Ultimate

"Pictures May Help You"

and i am sorry my English not good :(

Thnx .