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Screen works only after plug out - in Mountain Lion

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Joined
Mar 31, 2010
Messages
15
Motherboard
Gigabyte GA-P55A-UD5
CPU
i7-860
Graphics
HD 5770
Screen works only after plug out/in - Mountain Lion

Hi,
i am silently reading this forum since a long time and set up a few Hacks over the years..
Usually i find everyting through the search function - but not now..

I was running a hack on Lion and Snow Leopard without Problems.

SPECS:
8GB-Kit G-Skill RipJaws PC3-12800U CL7
Gigabyte GA-P55A-UD5, Intel P55, ATX, DDR3, PCI-Express - F12 Bios
Intel Core i7-860 Tray 8192Kb, LGA1156
Radeon 5770 1024mb
64GB OCZ SSD
2x EIZO 27" - 1x DVi 1x DP
1x SONY TV - HDMI

Yeasterday i updated it to Mountain Lion.

My steps:
1. Used my (working) ML-Unibeast stick to get into Installscreen
2. The Displays got black every time so i disconnected 2 of my 3 screens.
3. Black on Installscreen again so i plugged the Display out and in (DVI) and i had a picture.
4. Now i could install OSX 10.8.
5. But ow i have to plug out/in all the displays everytime OSX boots, what really sucks ;)

BTW i did a USER-DSDT installation (GA-P55A-UD5 F12) with MACPRO 3.1 as in SL and LION.
And i did not change any of the BIOS Settings i used in LION.

What could be the problem? Better, how do i get it to work without plugging it out/in all the time?

Thanks! :)
 
Joined
Mar 31, 2010
Messages
15
Motherboard
Gigabyte GA-P55A-UD5
CPU
i7-860
Graphics
HD 5770
I still have not found a solution. Anyone?
 
Joined
May 9, 2011
Messages
11
Motherboard
MBP 2010
CPU
Core 2 Duo
Graphics
nVidia
Mac
Classic Mac
Mobile Phone
having same issue like yours. Am also using ATI5770. Before was running Lion 10.7 and it was fine. After upgraded to ML, first power on the screen will totally blank but able boot in Windows (running dual OS with Win 7 as primary). After manually restarted the CPU, i can see the Bios screen and Chimera menu again. I have to repeat above every time i power off my CPU. Quite annoying but these was never happened on Lion...
 
Joined
Mar 31, 2010
Messages
15
Motherboard
Gigabyte GA-P55A-UD5
CPU
i7-860
Graphics
HD 5770
Anyone with the same problem or the solution?
 
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