HP Z800 (NVIDIA FX 3800) Black Screen After Installation

[brokenmill]

I have just finished isntalling Yosemite on a HP Z800 running an FX 3800 Quadro card. The install and post-install works via GraphicsEnabler=Yes string. However after running multibeast and rebooting, the screen goes black after the apple logo.
Error on screen via -v flag is Missing Bluetooth controller transport. Does anyone have success with this card on a Dual Xeon box.
Thanks

 

[brokenmill]

It now works via the following string

GraphicsEnabler=Yes USBBusFix=Yes EHCIacquire=Yes UHCIreset=Yes

This is on a Dual Xeon Processors. I have another build on Z400 that was much easier to setup/

 

[ypar]

Hi

I'm quite new to this... i've tried installing yosemite on a z800, following a youtube video advice, but it failed horribly (thousands of error messages, etc) - it used a different type of installer. I did manage to install 10.9.1 but I'd prefer yosemite.

Could you give me a quick hint on your procedure?

my specs are dual xenon/gfx 570

thanks for any pointers!
ypar