rog crosshair dark hero

I just mounted a pc but when I turn it on I find myself in this way. pc turns on but the bios does not start. I can't do anything more. since nothing works in the PC apart from turning it on from the power supply. the card remains with qcode 00. and there is no light indicating where the error is.

I am putting together a PC build and have the ROG Crosshair VIII Dark Hero Mobo with AMD 5900x CPU. I will be using 8 monitors on this computer and need to install 2 Nvidia Quadro P1000 GPU's. My question is, do I need to use a SLI Bridge to connect the 2 GPUs or can I just install the 2 GPUs...