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Was able to DL Sierra from the Apple link provided but still not listed in my MAS purchases. When I run Unibeast 8.1.0 to create the bootable USB it does not list Sierra. I do have the Sierra install icon in my applications folder. Any suggestions? Thx

Thanks, will try and report back!

That is correct I don't get the colors flashing anymore. And when I placed one of the two Kext back in the /Library folder it won't boot. I'm going to give up at this point and stick with El Capitan. It's a PITA that Apple has removed the OS from my purchases and can't DL a new build. :thumbdown...

After I install combo update 10.12.16 I noticed that these two files appeared in the /System/Library/Extensions/ AMDLegacyFrameBuffer.kext AMDLegacySupport.kext If I remove these two the video drivers are missing and I get large icons... I tried added one back but won't boot. The kext in the...

oops... Won't boot up with empty Extensions folder, stuck on the Black with silver apple icon. I'm going to reinstall and backup the kext folder before applying 10.12.16 combo update. Will post results. Thanks!

Uploaded sample screen shot... orange <-->blue. Will give it a try and post results, thanks!

Thanks for the quick reply. A1.- Yes. A2.- Sorry, only one monitor. A3.-Once desktop boots. I re-ran Multibeast but no improvements. How can I manually reinstall the kext for the AMD/ATI video? PS Graphic card listed as ATi Radeon HD 5000 2014 MB graphics.

Thanks for the steps. I used your guide to install El Capitan and decided to try Sierra using a new SSD. Everything works great on Sierra 10.12 so I ran the combo update to 10.12.6 and after the reboot my screen colors flash every few seconds, almost seems like they are inverted (eg: orange...

Thanks for the info. Will look into it when I have some time. Is rare when it happens. Been working fine for weeks. Using same exact parts except for SSD which is a Kingston and 600w PSU. -Thanks Again and will post if I have any additional question.

Thanks for this guide, worked out great. I'm only using a single monitor and notice in aprox 50x times that I have boot just twice I don't get any video after the bootloader count down. Have you had this issue?