[ref]MaLd0n[/ref],
A couple weeks ago you helped me with DSDT patching on High Sierra and I still couldn't get sleeping/audio working after the patch. Turned out it was the motherboard being faulty - I replaced with it and installed Mojave, it's now much better - built in audio is working, shut down works as well.
Now the only thing does not work is sleep - it keeps waking itself up every once in a while. Also I installed an AMD 290X graphics card, looks like Display Port Audio no longer works. Could you take a look at the 'send me' file and see if there is anything need to be tweaked?
Thanks!
Tee
Send me Janes-iMac.zip