Have you run SystemSettings-->Sound Card Detection?
EDIT: Also, disable PnP OS in the BIOS, it interferes with on board sound and video. Many times, just doing that, and sound is magically detected. :edit
Also, System Settings-->Display. Check the advanced tab and see if it detected your monitor. If NOT, you can find it, and even if not found, you can manually configure the horizontal and vertical rehresh rates if you have the monitor manual. Get rid of that 50Hz flickering, I can't imaging.