Spotty Wifi after replacing Airport Bluetooth cable

I finally got around to replacing the cable and I still had spotty wifi. The weird thing was that the calendar, date and time on the computer was backdated to 2014. It wouldn't allow me to change it but somehow, something finally clicked after shutting the computer down twice and trying again. Then the date self-corrected.

After that, I was able to get WiFi without any problem EXCEPT in the one area in my house where I needed it: (my office; go figure). But everywhere else, it worked seamlessly. The only thing I can figure is that something is blocking the WiFi for that computer in my office; As stated before all other products ( IMac, MackBook Pro 2009 (on which I am typing), MacMini, IPads and all smartphones) work fine with the WiFi. So, I think/hope thisMacBook Pro 2012 is fixed but I am stymied by the glitch in my office.

Any of you tech- experts care to weigh in on why I can't get Wifi in my office when all other products listed above work fine?