Catalina Install: Can't even get to BIOS/UEFI Setup.

Hi.

I'm installing Catalina onto a Gigabyte Z490 UD (Socket LGA 1200) DDR4 ATX with Intel Core i7-10700K 3.80GHz LGA1200 but no video card as yet. I've made the Unibeast usb stick and everything looks ready to go but I don't even get to the BIOS screen when holding down 'del', the fans spin up and there is power to the MB and the monitor is connected via HDMI to the on board graphics output. Only my 3rd Hackintosh so any help would be appreciated. All new components and the monitor works...

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Author: stratblue