I've also noticed that even though there is no sound device connected to the machine, the sound icon in the taskbar is still not crossed out, and I can adjust the volume like there are headphones, etc. connected.
I'm not sure what you mean by sound software, if you're talking about the drivers, it's an IDT High Definition Audio CODEC
And no, I haven't been to sound properties to enable my rear jack as the default audio input, how would I go about doing that?
I bought a couple of small speakers for my PC, However, it has a headphone jack made for a laptop along with a USB plug for power. The speakers seem to work when I plug the headphone jack into the front of my PC, that has a jack for earphones, etc.
However, I use the front jack for earphones...