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Screen goes nuts at first boot
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Question

Screen goes nuts at first boot

I can install Maverick or Yosemite without a problem. But when I boot for the first time, my screen goes nuts (as seen in the picture).
At the point of selecting a Country it freezes and after 20 Minutes I get to the Desktop and only an external USB Keyboard and Mouse work. (USB 2.0 Ports used not the 3.0)
I've tried with "GraphicsEnabler=Yes or No" and" IGPEnabler=Yes or No" as well as -x or -f.

Notebook is a HP Elitebook 8460p with an SSD and 16GB of RAM.
Any ideas for a fix?

photo_2016-07-18_18-36-44.jpg

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