Hello all. I am having problems with the Wi-Fi not working on my MBA. I have replaced the airport card, and the Wi-Fi still does not work. This problem in the beginning was intermittent, and slowly got worst and finally quit. Now I have a No Modem Configuration Found, and the airport card does not slow in the system report. I was wondering if I have a logic board issue. The wi-fi not working is the only problem that I have. I have reloaded Yosemite. My Macbook Air is a 13 Inch Mid 2013, OS X Yosemite 10.10.5. Thank you