I then migrated windows 7 to uefi.
I now have partition 1 = ca. 200 MB UEFI, partition 2 = windows msr 128 MB, partition 3 = NTFS Win 7 64 bit, partition 4 = Mac OSX extended
I can boot into the OSX installed on partition 4 by booting the uefi file from the USB stick and then chosing my install partition. I can also run HP Probook Installer. It finishes with a success message.
But I can't boot uefi from the hard disk even though I check write clover uefi bootloader... Booting from hard disk always results in a Win7 boot so I have to use the usb boot method to boot into Yosemite.
Should I re-install OS X Yosemite from the usb stick? Or is there a simple way to get a uefi boot menu entry on my hard disk for the OS X installation, perhaps some repair uefi boot utility for os x?