Running Verbose, shows circle with slash through! Any help appreciated

[Quillith]

Used the guides posted here, but upon install apple logo hangs. Having run verbose, a circle with a slash appears. I have screenshot the image so you can see what it looks like. Can post my efi folder if needs be. Would really appreciate any ideas as I am lost.

 

[P1LGRIM]

Search for 'prohibitory symbol' or 'still waiting for root device'.

 

[Quillith]

Search for 'prohibitory symbol' or 'still waiting for root device'.

Thankyou! Switched to a 2.0 usb device so hoping this works Gotten through the first install setup up so seems to be going well.