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I am having similar issues, can't even log on to iCloud through system preferences pane... I am still looking through the guide, so I'll let you guys know if I arrive at anything that works for me.

I've gone over portions of the sticky in this section, although I still can't figure out what needs to be done to fix my iCloud login problem from System Preferences. Essentially, I have everything seemingly working, but as I try to login to iCloud from the System Preferences pane, I get...

Hi Slim.Jim, I got it working by using boot flags: nv_disable=1 and then installing the nvidia web drivers which were recently updated and now install on the system. After rebooting, system works great even without the boot flags :) Just one problem with iCloud, but I will post that in...

Hi everyone, So, I grabbed all my hardware from the list in the guide on tonymac, and everything seems to be working well (small issue that I need to resolve with TPlink wireless card, but not a huge issue). I am currently using the on-board graphics card, but I have a NVIDIA GTX Titan X (12GB...

Hi Guys, I've been going at it for a while now, and reading as much as I can on the forums/web to fix my issue, but no luck yet. I've got Yosemite installed on my Dell Precision T7600 (It has Dual Xeon procs, and Intel Motherboard chipset C600). I keep getting the occasional "a graphics error...

I've progressed in the setup, although it has strange behaviour: I still get the occassional "A Graphics Error has Occurred" dialog box, not often at all, but it happens only sometimes after the computer freezes for a longer period of time (like 20seconds). I've changed some settings in the...

An update on the setup (tried a variety of things and read a lot since last post): I have two problems, I highlighted in green. I got it to boot up into the install after disabling HyperThreading (thank you for the advice). 16-cores seems to be the limit as you mentioned. It's annoying since...

Thank you :) I am going to try this out, and let you know what happens.

Do I need to post more info? They are E5 Xeons, I found one existing forum thread on it, but It didn't really have anything I could use. Would the procs, video card, or the raid card I have listed be the issue?

I've tried various boot flags, including USBLegacyOff=Yes, dart=0, as well as completely turning off Virtualization Technology, and Speed Step. Still no luck, I am hitting a wall. Anyone have suggestions? Please. :)

Hi Everyone, I've attempted to search and scour this site and the web for a solution, but I am hitting a road block at this point trying to install Yosemite on my system. Hardware Details: Dell Precision Workstation T7600 -- BIOS Revision A07 Dual Xeon CPU 3.1GHz (8 cores, totalling 16cores...