Hi Oliver,
I'm so glad to hear that everything is now working, even if you did have to get a new computer in the end :)
If you feel my previous suggestions were helpful, and could be helpful to others, would you be able to mark it as an Accepted Solution? That way others can find the post more easily, but if you feel the new computer was the ultimate fix, don't worry about it!!
Thank you so much for your time and patience, have a great day!!