This happens periodically, but I still don’t know why….very frustrating.
2011 MacBook Pro, High Sierra 10.13.5. 10 other devices in the house using WiFi no problem, between Galaxy S9, 3 iPads, an HP laptop and numerous smart TVs…. this has happened at home as well as on the road and I know that it is my MBP, but usually I manage to fix it- not this time. Have reset both SMC and PRAM. Have deleted WiFi service and re-added it. Have manually entered IPv4 addresses and DNS servers. Probably did some other things that I don’t remember anymore…
Restarted numerous times. Don’t know what to do anymore… usually it comes back by now, but no such luck. What else can I try? I have even been in Terminal running some commands to try to clear my caches etc…When I ping a DNS server in Terminal like Google’s, 8.8.8.8, I get responses, but I have to manually set my IPv4 address and subnet mask to 255.255.255.0. When everything is configured like normal, i.e. IPv4 using DHCP and IPv6 configured automatically, I do not have a self-assigned IP address, but it does show me having an IPv6 address, which is weird and don’t recall seeing that before, usually it is an IPv4 address. When I get my IP address in terminal, it is not a class C, starting in 192, but rather a class B starting with 169 and the subnet mask is then 255.255.0.0, which I never see.
I also cannot boot into Safe mode for some reason. When i get to the logo screen and the progress bar underneath, the progress bar gets halfway and then the screen goes dark and it powers off. I can boot into recovery mode and if I use the Get Help Online section and open Safari, I GET ON THE INTERNET JUST FINE…. so what the heck gives?? Doesn’t make any sense… Please help…
Thank you!
Best Answer
After talking in a chat with the OP. I suggested the following solution, which in the end solved the issue.
Follow these instructions to reinstall macOS: