OK, remove ALC885HDA.kext and restore the vanilla AppleHDA.kext then reset permissions and rebuild kernel cache.
This DSDT should give you line out and headphones, make sure you select line out in system preferences as headphones is the default.
FYI the 'not authentic' error is caused by permissions. Just use disk utility to repair permissions then try to create your kernel cache.
SUCCESS!! It works, and it's perfect (so far). Thank you JamesLittler and everyone who tried to help. You guys rock!