2017 iMac 5k stuck at Apple logo

Hello

Looking for some help, my first time trying this.

I’ve created a usb following all instructions and have taken a Time Machine backup of my device.

I boot to the option screen and select EFI boot, then selecto to install the MacOS.

The screen then goes to the Apple logo and has stuck on that screen for the past 10 hours. There’s no progress bar, to suggest anything is happening.

I’ve tried closing it and resting the NVRAM (a suggestion on another forum) but still get the same result.

Anyone have any ideas or suggestions?