Okay, so I was only just able to properly test this out on my PS3. Oohboy that mix up is obvious. Turns out this isn't just an issue with the PC.
I'll definitely be getting those cables madmatt30, thankyou for letting me know about them.
So, I recently did a bit of screwing around with my setup so that I have everything from my PC to my consoles using the same monitor and sound system (Logitech Z506) without buying a home theater system/new speaker system right at this moment.
It looked impossible at first thanks to Logitech...