FREE ADVICE ON HOW TO CONNECT A LAPTOP TO TV USING HDMI TO HDMI CABLE

Since that's obviously the real problem, my first bit of advice is to state the actual problem upfront. Asking how to connect an HDMI cable to your laptop isn't the same as asking why you don't have sound from the HDMI cable you already connected to your laptop.
 
go into the windows audio properties and change it there (rt click on the speaker in the lower right hand corner, select playback devices, select your HDMI, select apply). Note that not all motherboards/soundcards/video cards will support audio pass-through over HDMI, but your should.