DVI to HDMI and 3.5mm audio connected but no sound

Hi folks, so I got a new pc and connected it to my LG 42LV550T using a DVI to HDMI and 3.5mm from line out (and tried headphone socket) to the 3.5mm audio in (RGB/DVI) socket on the TV but I don't get any sound on the TV.
I connected the PC to my stereo using the line out and headphones socket with 3.5mm to stereo/phono plugs and I get sound, but I would like the sound through the TV and then the TV connected to my stereo for better sound all round.

I know DVI doesn't carry sound.

I had a chat on LG support with no help :down:

Any ideas ?

PC specs.
OS Version: Microsoft Windows 8, 64 bit
Processor: Intel(R) Core(TM) i5-3330 CPU @ 3.00GHz, Intel64 Family 6 Model 58 Stepping 9
Processor Count: 4
RAM: 8082 Mb
Graphics Card: Intel(R) HD Graphics, -1984 Mb
Hard Drives: C: Total - 953516 MB, Free - 897064 MB;
Motherboard: Gigabyte Technology Co., Ltd., H61MA-D3V
Antivirus: Windows Defender, Disabled

Thanks TechnicalH1 :D