No one can help you when no one but you knows what you did.
Here is a hint: in the linked thread, Post #1, find "Problem Reporting".
Toleda,
I think I was clear about what I did... But maybe I should make it even more clear
1. I successfully installed Yosemite
2. Run multibeast, installed easybeast
3. Restarted and load successfully Yosemite with Chimera
4. Run multibeast, went to drivers-->audio-->Realtek ALCxxx-->ALC 892. Build-->Install
5. Restarted
6. No Audio and No Audio Output Devices in System Preferences
My Mobo is MSI P67A-GD55 and as you can see in the following link it uses ALC 892!
http://eu.msi.com/product/mb/P67AGD55.html#hero-specification (hit the details tab under specifications)
As I said in my previous post, the ALC892 driver worked for me on Lion, MLion and Maverics in the past.
Also I don't use any DSDT
Should you need any other info I ll be glad to provide it.
Any help will be much appreciated
Thank you in advance
Regards
G