Stop signal after Install Mac os From High Sierra

[photo8x10]

I just resolved some problem during my first high sierra installation, but now I don't understand what happen.
I use the installation guide here. After I did the first part of installation with problem, after the reboot choosing install Mac os from High Sierra, I'm having the stop signal. I tried lots of time but never had the possibility to go on.
Can anyone give me an advice to understand what's happening?
Thanks
Stefano

 

[photo8x10]

No one know this problem?...

 

[P1LGRIM]

No one know this problem?...

Please use the search function before creating a new topic. The question that you ask may have already been answered

This is an extremely common problem which has been posted and solved many times.
Search for "prohibitory symbol" or "still waiting for root device".

 

[photo8x10]

thanks #P1LGRIM I'm reading, but no find my problem jet, because the first part of installation by usb is started is at the first reboot when I should complete the installation that signal come out...