I quit trusting "Geniuses".
I replaced the airport card, but that didn't solve the problem.
Easy fix if it's the actual problem.
Replace a damaged or malfunctioning 802.11n Airport/Bluetooth board in your MacBook 13 inch Unibody Mid 2010 laptop.
This Airport/Bluetooth board may fix problems with making wireless connections to Wi-Fi routers or to Bluetooth equipped accessories like wireless speakers, headphones, and keyboards.
|MacBook Unibody A1342||