Your mobo is socket AM3, e.g., the AMD Phenom II (circa 2010). Phenom II was one of the fastest CPUs of the era, but today it is hopelessly out of date.
The repair cost plus your time and effort would likely exceed the replacement cost with a modern low end PC with a low tier NVIDIA GPU.
Would that low end NVIDIA GPU have the 7.1 surround output at high quality? That might be the deal breaker (within limits).
That said, if the MoBo is shot, yeah, prolly gonna have to scrap the monster. Or give it to my daughter’s friend.
There is SOME sentimental value since this machine was my brother’s.