So here’s why I haven’t been posting lately, my iMac has pretty much taken a giant dump over the past 2-3 weeks and it’s gotten progressively worse. It started in the Beta of Yosemite 10.10.3 – I was having lots of random crash issues at first. Then it started into banding on the screen. Reboots worked at first and that too became worse and worse.
I then downgraded out of Beta to Public release of Yosemite 10.10.2 and it seemed to be good for a day other than not having my latest pics from the new Photos app available. I can live with that. BOOM. Auto-Update puts me back to 10.10.3 and the machine just goes belly up on me for a lack of a better description. The only way to get it working at all was to disable the graphics car entirely with a bunch of commands after using Command-S to boot up in single user mode or something like that.
My Apple Support journey
Many online the Apple Support community pointed to this link: iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program. and at first I was very skeptical. I posted on the Apple Support community my experience and last resort after trying everything else was the worst thing you can image. Format and Re-install. Man, I left Windows to AVOID THIS SHIT.. 3 years is a good run with no problems so I bit the bullet and found a workaround.
Disabling the video card so I could get on the system and make sure I had EVERYTHING backed up. I don’t have Time Machine running for which I only have myself to blame.
Here is how I disabled my iMac’s graphics card and used only the intergrated video:
OSX Yosemite Login Screen Glitch