since the mobo is detecting missing components.
few things you might have not tried.
using a different pci-e slot for the GPU.
removing the cmos battery, then powering up the system.
using the onboard display port
brushing the entire motherboard with a soft bristle toothbrush ("specially the pci-e sockets")
I've tried removing the CMOS battery for 5 minutes then powering it up. I only have 1 pci-e port but this mobo does apparently have onboard and i've tried just booting with RAM/ CPU/HSF and just got silence everything spinning fans working etc but no beeps or post. Only beeps I got was when no ram installed.
Does removing the CMOS battery and trying to boot the mobo without it do anything special I havent tried this yet