I've just inherited my brother's computer. He was a serious gamer and build/upgraded his machine. I reformatted the hard drive (way too many games to uninstall) and loaded Windows 10. I've just plugged it in and tried to play some music while loading stuff, but the speakers don't work. When I plug one of the leads into the headphone jack, I can hear it just fine. It has 16 GB mem, 8Core processor (3.61 Ghz). The surround sound jacks are on the motherboard, not separate. It's an Asus Republic of Gamers motherboard if that helps. According to Device Manager, there is a 'High Definition Audio Device' and "NVIDIA High Definition Audio. There are matching jacks on the sub-woofer, back of the computer and cord to connect them (green - front L/R, black - rear L/R, yellow - sub/center). It also seems to have a digital sound out (optical) that is not plugged in. (somewhere I have a TV sound bar that has an optical input. I have not tried it.) I've already tried Control Panel/Hardware and Sound/Manage audio devices/ It shows multiple devices Speakers/2-High Definition Audio Device/Not plugged in Headphones/2-High Definition Audio Device/Not plugged in Digital Audio (S/PDIF)/2-High Definition Audio Device/Default Device (green bars monitoring output when playing - still no sound) Digital Audio (S/PDIF)/2-High Definition Audio Device/Ready NVIDIA HDMI Output (Port 0)/NVIDIA High Definition Audio/Not plugged in NVIDIA HDMI Output (Port 1)/NVIDIA High Definition Audio/Not plugged in NVIDIA HDMI Output (Port 2)/NVIDIA High Definition Audio/Not plugged in NVIDIA HDMI Output (Port 3)/NVIDIA High Definition Audio/Not plugged in I tried plugging in the TV's sound bar into the optical out connection and that works fine. For some reason, it is not recognizing the standard outputs to the speakers.