Onboarding after fresh installation

I have just flashed a new SD card with the latest image 2.12 - 32bit version for Rasperry Pi Model B.
Used my PC - After files were loaded I was asked for registrating the login detail, that went fine.
But afterwards the onboarding.html file is trying to load, but in all my browsers (IE,Chrome,Firefox) comes up with this kind of error message : “Something went wrong loading onboarding, try refreshing”.
I have tried erasing the cache, even reinstalled the browsers without any luck. But when I use my phone, I can connect to it and it works. So the problem is only on the PC. I have installed Home assistant on a flash card before without having this problem. Any ideas?