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Yosemite on P55A-UD3 problems

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So I'm trying to help a friend upgrade from a wonky Lion install and am having mucho problems.

I am able to install Yosemite just fine using the regular method, only mod was adding legacy USB support

Once installed, I can boot into the fresh install via f12 to the USB and then selecting the Yosemite drive.

Here's where I run into problems... once I run multibeast, I can no longer boot into the Yosemite install, I always end up at the "PCI Configuration" line and that's where it stalls (using -v, verbose mode). no dice in safe mode, tried lots of boot flags, nothing. I ran a DSDT-free version of multibeast as well as using the DSDT for the mb as found here with the same results.

Once odd thing is that at this stage, if I boot into the USB installer it no longer sees the Yosemite drive under Disk Util or for the actual install. Not sure if this is related or not.

Anyone?
 
bump. anyone have any suggestions?
 
You should post the complete hardware specs of the build. Motherboard model - GA-P55A-UD3, CPU model No....GPU model No....
Did you create the MultiBeast flash drive with the Legacy USB option? List MultiBeast selections so people can see what you have installed. - you may have missed something or omitted something important. Are you using a DSDT?

Use search with the motherboard model number - there isn't many that have used this board and not many around with similar P55 hardware.
 
Hopefully you have figured it out by now as I am replying a little late. I just spent many hours today with the same situation. I have a GA-P55A-UD3 Rev 2 BIOS F11 board. I did a fresh install of Yosemite today after being on 10.6.8 (Snow Leopard) since it came out.

I could boot using the Unibeast USB drive that I made (reference the tonymacx86 instructions) using the following boot options:
-v GraphicsEnabler=yes PCIRootUID=1 npci=0x2000

Once the install was done, I could boot into to the Yosemite build using the USB drive and the above options. But as soon as I ran Multibeast with the proper DSDT and the "common" settings, it would get stuck at the "PCI Configuration Begin". I found somebody had mentioned in another post about checking the option in Multibeast for "AppleACPIPlatform Rollback" under the Drivers-->System menu. Once I selected the "10.9.5 AppleACPIPlatform Rollback" option and let Multibeast build the system, I can now boot each time straight into Yosemite without going through Unibeast on the USB drive.

So I recommend giving that a try if you still are struggling with this issue - YMMV.
 
I use a Kepler Nvidia 670 card, so no GraphicsEnabler needed (i.e., left as =No default). But these options:
PCIRootUID=1 npci=0x2000

were critical to successful 10.10.4 update.

One warning in transitioning to 10.10.4 from 10.10.3:
I had a repeatable issue with BIOS boot display. I would boot fine with Unibeast but on the second boot after running MultiBeast, somehow my BIOS bootup display was not showing up. I had to keep resetting the CMOS (by putting a Phillips screwdriver on the jumpers) to get my BIOS boot display messages to show up.

The 10.9.5 AppleACPIPlatform Rollback was critical to get the BIOS to display properly - many many thanks to Rick Fowler.

So beware. I don't know what Apple subtly introduced here in 10.10.4. I've made the 10.10.1 --- 10.10.2, 10.10.2 --> 10.10.3 transitions without this previously. Something in this 10.10.4 update is affecting the BIOS bootup display.
 
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