Hi fsbx
I tried all 6 suggestions without resolution. Although I could not complete option 6. I could get into safe mode. But not safe mode with networking.
A few months ago I changed the motherboard and CPU using an existing case. ASRock. I have tried contacting them but no response.
Interestingly, we have yet another PC in the household. It also gives fast down and slow up. Does better with WiFi than ethernet, although it does have a Gigabit network card.
I feel there are (many) other things I don't know.
Cheers
John