You might want to try either booting into safe mode, which will force your computer to run the generic audio drivers, and not the ones specific to your sound. If that doesn't work, try another OS by booting onto a USB drive with a Linux Distro on it, and see if that works. If it doesnt even work with linux, there might be a problem with your hardware.
One thing you should remember is that you shouldn't declare it final as long as you haven't tried absolutely everything. My friend's laptop's trackpad wouldn't work and he was about to get rid of it, but we booted Linux on it and it worked and we found a way to get it working again on Windows.
Don't give up man!