I'm on my first build here and I am using an ECS A885GM-A2 motherboard. The audio jacks in the back do not work at all. I did install all the drivers from the disc, and when I plug something in, Windows recognizes it and asks me what I plugged in (e.g. speaker, microphone). When I playback audio, the bars move in the volume mixer yet I hear nothing.
I've tried with a verified working set of speakers and a set of headphones.
The front panel audio jacks work (sort of) but have an entirely different problem that I am not tackling now. Currently, I am using a USB audio interface, but even this is cumbersome since I have to unplug it and plug it back it in each time my computer wakes from sleep, otherwise it doesn't work.
Both of your problems are the same as mine my motherboard is ASUS P5Q PRO, i put up a post earlier today about this, mines started to not work for skype but everything else worked now my sound has taken a *** on me , i might have to get a external sound card