You could also get an RCA to 3.5mm plug adaptor and plug it into the line in of your PC. The only downside is that you'd have to have your PC on to get sound. I used to do this when I had my Xbox connected to a computer monitor and it was a PITA when I'd turn it on and then remembered that my computer wasn't on and I had to turn it on to get sound, even though I wasn't even using the computer.