How can I connect the sound from my laptop to my HDTV?

Your TV may make this impossible, most TV’s only take one signal at a time. There may be a USB to HDMI converter available that could carry both the picture and audio signal but I would hazard a guess at the quality being pretty shit. If you have a stereo/surround sound system in the same room as the TV then you could always hook the VGA to the TV and the audio to the sound system and bob’s yer uncle.

@RareDenver Wow, I can’t believe I didn’t think of hooking it up to my surround sound system! Genius!

…and what?? “bob’s yer uncle”?

“Bob’s yer uncle” is the shortened version of a British saying “Bob’s yer uncle and Fanny’s yer auntie” which kinda means “that’s the solution, there’s your answer, that’s how it works” I’ve no idea wher the saying came from, maybe I should pose the question to the Fluther community?

Edit: there’s a whole Wiki article on it

http://en.wikipedia.org/wiki/Bob's_yer_uncle

there is a 3.5 mm to composite(the red and white) adapter that could deliver the audio to your tv.

something like this: http://www.amazon.com/RiteAV-3-5mm-Stereo-Female-Cable/dp/B0018MI5F6/ref=sr_1_3?ie=UTF8&qid=1302743579&sr=8-3