Accidental update to 10.8.5 - HELP needed! [noob alert]

[BadAppleX]

Accidental update 10.8.2 to 10.8.5 - HELP needed! [noob alert]

Hey friends.

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CPU build:
Gigabyte motherboard H77 chipset 2x USB 3.0
3,49 GHz Intel Core i7
16 GB 1600 MHz DDR3
NVIDIA GeForce GT 640 2048 MB
240 GB SSD OCZ
2 TB HDD
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 Accidental upgrade to 10.8.5 from 10.8.2.
Stuck at 98% of the installation for 4 hours.
After restart: stuck at Apple Logo and Spinning Wheel

 Got into Safe Mode. I've just learned about -x and -v last night.
Everything worked. Graphics were laggy.
No Time Machines backups... I have no Unibeast USB.

 Installed Multibeast. After that everything got even more screwy. Boot screen changed from the slick dualboot graphics to this more 'tonymac' style screen:


Followed by these:


Can't get into Safe Mode anymore.
Can't shutdown computer (auto restarts every time).

I don't know what to do now. I'm panicking like a kernel!

 

[BadAppleX]

Any assistance is greatly appreciated., it feels like I'm just making it worse

 

[RehabMan]

It looks like a graphics problem to me. Are you using GraphicsEnabler=No ??

 

[BadAppleX]

Thank you for replying.


I tried -v PCIRootUID=0 GraphicsEnabler=No
before I went into safe mode and installed Multi Beast.

Should I enter that line at the bootscreen or just GraphicsEnabler=No ?

 

[RehabMan]

Thank you for replying.


I tried -v PCIRootUID=0 GraphicsEnabler=No
before I went into safe mode and installed Multi Beast.

Should I enter that line at the bootscreen or just GraphicsEnabler=No ?

Try adding "-f" as well. I could be a poor/failed kernel cache rebuild...

 

[BadAppleX]

Tried -v PCIRootUID=0 GraphicsEnabler=No -f

First the grey screen then this black screen (same as before?):

 

[RehabMan]

Tried -v PCIRootUID=0 GraphicsEnabler=No -f

First the grey screen then this black screen (same as before?):

View attachment 67811

Definitely a graphics issue. Interesting that AppleIntelSNBGraphicsFB is trying to load on your system which has Nvidia discrete graphics. Are you sure you have BIOS setup to disable onboard graphics?

 

[BadAppleX]

Is it this option in the bios?

 

[RehabMan]

Is it this option in the bios?

View attachment 67813

I would say so (note: I don't have your board).

 

[BadAppleX]

Holy smokes! I'm in!

How can I start as pre-upgrade again (with no grey and black screens) and change back to the orignal bootscreen?

I would say so (note: I don't have your board).