Ok. As I see you have an Intel Xeon X5460 (Harpertown), you don't have an available Intel internal GPU (iGPU) for the OS to boot from. That means you MUST boot with the Nvidia.
To boot with the Nvidia, you will likely need to boot with these boot-arguments (boot-args) set in EFI/Clover/config.plist using the Clover Configurator app (these are settings I used in my previous Nvidia builds):
dart=0
darkwake=0
slide=0
kext-dev-mode=1
npci=0x2000
nvda_drv=1
alcid=1
And you also need to make sure your BIOS settings are Hackintosh compatible (for the best results).
Have a look at the following builds/posts, especially the first link. It should show you the correct BIOS settings you must set first before booting with the Clover bootloader:
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https://www.tonymacx86.com/threads/successfully-installed-sierra-10-12-4-in-asus-p5q-e.217932/
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https://www.tonymacx86.com/threads/...8-and-p5q-p45-issues-with-sandisk-ssd.237284/
Also the alcid setting above refers to the sound card layout - you must have this setting for the sound card to work. I checked you have a Realtek ALC1200 sound codec on your motherboard. We set it to 1 as a guess but you can change this from 1 to 2, 3, 4, 5, 7, 11, 27, 28, or 29 if you don't have sound. If you have the AppleALC.kext & Lilu.kext installed and apply the correct layout number, the sound card should work.