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I have a MacBook Pro unibody 2012. Had it since 2015. It would boot so I used online diagnostic. Then it said there is nothing wrong with it. So I used shift+option+command +R I ran disk utility & it told me I had problems with my partition, so I erased them. I asked it to reinstall the OS, it came with El Capitan. When I tried to Reinstall it told me I was not connected to the internet. It just used it!!! I even tried using my Ethernet cable, same problem. I’m on my last nerve with this thing. I practically rebuilt my iMac I know how to repair Macs but lately, nothing. I had to fix the iMac because Apple said it was too old. I bought it in 2007 & by 2014 it was too old, that’s crazy!

It’s unclear from your question whether or not you’re trying to use Recovery Mode or Internet Recovery Mode. If the internal drive has been erased, the portion used for Recovery Mode may be damaged. Try rebooting your machine while holding down “command+option+R” until you see a progress bar or an option to select a Wi-Fi network. If you’re unable to sign into a Wi-Fi network here there may be a deeper issue with your AirPort card.