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It was the Mac Pro 3.1 System Definition that did it. Had to reinstall and change to iMac. Hope everything runs well now.

Same for me! Any fix?

I gave up and tried a fresh install. The fresh install seemed like a success until I tried to boot up after multibeast. It could not boot. Not with the USB or HDD. And yes, I tried the Rollback setting and deleting the kext chache (like someone adviced me to do.) Any clues? I am...

Hi I am not getting this to work. The first thing I tried was to update from me sweet Maverick install, but that didn´t do it. I got stuck at a loading bar after "successfull" installation. I never actually managed to boot into Yosemite. Now I am considering doing a fresh install. Maybe...

@Michael Have you fixed your system?

Thank you se much! I am trying it now :D

It froze after 28 hrs.... Thank you! Have you ever had any problems with freezes?

It has still not frozen? :)

I tried to remove the bumping of the ram to 1600 mhz, disabled autosleep and resting-harddrives and I disabled C-states and EIS. I currently have 20 hours of uptime. I have no clue what helped, but it works :) What do you think did it?

1. Yes it wakes from sleep. 2. I haven't touched that. So it is default. I can check later :) Miniupdate: I tried to remove another ram stick, and pc has run stable for the last 4 hours with only two ram sticks. What can this mean?

Bios: - BIOS Feature - Intel Virtualization Technology = Disable - Peripherals - XHCI Mode = Auto - XHCI Hand-off = Enable - EHCI Hand-off = Enable - Power Management - Wake on LAN = Disabled - Internal Intel Graphics - Disabled What I enabled...

mr.s4ndm4n - Have you fixed your issues?

Mike: Does Prime 95 still stop your system from freezing? We are going to find a solution some day! hehe.

UPDATE: I have now flashed my bios, disabled internal graphics and bumped my ram voltage. I still have freezes... What can cause freezes? Anyone out there with solutions? This is soo bothering. :(

Will there be any problems for me to flash the Bios afterwards? Since I already have installed OS X. Where do I look for IGPEnabler string? Thank you so much for your help!

Thanks for your help! :) http://www.kingston.com/us/memory/hyperx/blu - according to this site it supports XMP. So that won't work But I will try to disable the internal graphics for sure. What will this do? And why? I believe that graphicsenabler is supposed to be turned off with my...

Hi :) I hope your solution works for a stable system! "I removed the following .kext files, ran the kext utility, and the system is now 100% stable." - how did you remove those kexts? I am a newbie...

So I am supposed to disable internal graphics? - I am going to try that :)

Germak - Have you ever had any problems with freezing? I believe I already have those settings set. Mikael Bjork - My rig freezes during use. So I don´t think that would make a difference. Any more suggestions? Or solutions you have heard of?

I didn´t work to bump the power... :( tailchaser - What kinds of freezes did you experience? I have not turned off my internal graphics. Am I supposed to do so? rccollins - I hope I dont have to switch motherboard.... Ahhh. this is annoying.