Hard to help when you dont even provide any makes/model numbers
Seriously though- there are so many variables here that it's required.
I suggest replacing the video card too since they are cheap. Hard to recommend speakers w/o knowing your approximate budget.
Help us help you, basically(!)
Something in my computer, most likely the GPU had busted. I can get video but not audio.
I need to know a way or another way to use these built in speakers on the TV.
I tried a audio 3.5 into the headphone jack on the TV into the light-blue jack on my computer, but got nothing.
I live right next to a Fry's electronics and could get really anything.
Is there anything I need to make this possible or should I look into a speaker system?
(Also possible to hook speaker system into a switch/spliter to get the TV speakers working as well?)