Problem aubout sting up

Hi there;
I had a Power outage and I need to install my Home Assistant on my raspberry  Pi again. But now there is problem where the side stops loading after the "preparing screen"and if I try to reload the side, my browser shows me a text where its says that it cant reach the website since the home assistant is blocking the connection. Do you have any Tips or Ideas how I can try to fix this.
Thank you.