Thanks for the help Deepak, i had tried this one before along with 2 others i found on that site that came down as 3185-Radeon 67-Radeon 6770 new kexts. I think now I have a better understanding, what the Pro Book installer does: 1) installs patched kexts 2) modified the DSDT 3) modifies the 6000 controller kext 4) But only to Yosemite, that is an older OS and not desirable for my line of work I installed Sierra on a new HDD, mounted the EFI from the Mavericks install and copied the folders in the EFI to the new EFI partition on the Sierra HDD. I was able to get everything including the video card to work on Mavericks, by dumb luck. The USB 3.0 was enabled by the generic USB kext from Rehab Man (thanks), but I'm not sure Sierra is running USB 3.0 at true speed. I have been unable to resolve the video card problem to get it working in Sierra. If you stay to versions Yosemite and earlier you may have luck with post installation with the HP Prebook installer app.
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