There is a bios setting to change the primary display device.
also remember that you'll have to swap the cable from motherboard to the card.
So boot with APU graphics, change the primary device to PCIE, reboot and swap the cable
There is no APU on Richland 760k. Ended up being the PSU even though everything powers/lights up fine. Swapped it with the 850 in another rig and it went to working. Sigh. Thanks all.