Why does my wifi card show 'No Hardware Installed'?

"I had the same issue REPEATEDLY with my 15"" early 2011 MBP. I tried all of the software fixes, resetting PRAM, etc. Even had it serviced multiple times by Apple. Didn't matter what version of OS X I was running, I always ran into the ""No Hardware"" issue.

But I finally found the solution. It's 100% hardware in mine and many other's cases. The problem is the wifi/Bluetooth cable. It runs over the disc drive and is prone to failure. Check out http://warrantyvoidifremoved.blogspot.co... for the full fix instructions."

Have you attempted to reset the SMC? That would be the first step. Hold the left control, option, shift key and the power button for about 5 seconds and release. Then try to reboot. Might as well reset the PRAM as well. Hold command, option, P, R on start up until the machine restarts. If that doesnt' have any affect we'll have to dig deeper into a potential hardware failure.

So, I got this MacBook Pro 2012 A1278 used from a guy at school (don't worry about the trade). Anyway, I reset everything I could and it didn't work. So, I went to Apple, they will replace it for $125.00. When they pulled up the serial and saw that it was fixed at non-Apple store, they denied fixing it due to non-Apple parts. So, I went to Computer Hospital (Houston, Texas, they said my Wi-Fi was fine, but my motherboard was bad and it would be a $825.00 job. So, obviously I didn't go for it. Since I replaced my RAM before, I had a spare Apple kit and went inside. I ordered a $15.00 Aiport card off Amazon and replaced it. It started working and stopped. So, I tried a Wi-Fi USB (Edimax). Garbage, doesn't work with most Wi-Fi (e.g. like my school). So, I ordered the ribbon that connects to the Airport card to the motherboard and it's currently working at the moment. I hope this will solve the problem!(:

"Same problem. MBP 2011 15-inch. Turned out to be that flat cable here too.

-JM"

"Another Mac Technician having suffered this same problem a coupla' years back;

Otherwise mint-condition MBP 15"" 2012's WiFi would occasionally work but was essentially useless. If and when it worked at all, WiFi would never stay connected for more than a few minutes...

wasted time fooling around with software for a while, then replaced the AirPort / Bluetooth card with a brand-new one... still had exactly the same problem... frustrating!!!

Finally replaced the ribbon connector from MLB to Airport Card.

WiFi. now. perfect. FWIW, the failed cable showed NO sign of wear or damage & was probably defective the day it was made.

I have another 2012 MBP 15"" waiting on the bench with the same symptoms except this one doesn't detect the WIFI at all but does see Bluetooth... will first try a known-good cable this time.

now where did I stash that Airport Card that I pulled on that last one... ?"

"Hi All, some possibility

1. The Wifi Cable Came Loose

2. The Wifi Card has failed

3. The Logic Board section, inductor has blown.

4. The Cable is faulty."