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The question is as the title says. I just installed my optical drive back into it's place, and a few cables got loose (namely the audio and "display" cables). I plugged them back in and switched on the Mac, but it said wifi hardware not detected. Normally one would assume it's a problem with the display cable (which is the cable for Bluetooth, the camera and wifi), but Bluetooth is working perfectly, the camera is functioning, but the wifi icon on the task bar still says the same thing. I ran a system report and refreshed it, and surprisingly the wifi card was being detected there! I reset PRAM and the SMC to no avail. What's going on?

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    Try re-seating (removing and reinstalling) the Airport (wireless) card. Also run Apple Hardware Test (AHT). Hold the D key while booting from a powered off state with the AC adapter connected. It's possible that the network portion of the card may just have gone sideways and it now needs to be replaced. – Allan Apr 29 '17 at 11:37
  • @Allan I can't boot into AHT for some reason. Also, I'm not very comfortable in going to the airport card, because it is buried quite deep inside the Mac. Are you sure the issue lies there? Because it seems to be something in the optical Bay Area only. – Rushat Rai Apr 29 '17 at 11:51
  • Re-seat means connect/reconnect. Disconnect and reconnect whatever it is you serviced previously. Did you try Option-D? Also, you may need Disk 2 if you MBP came with installation disks. – Allan Apr 29 '17 at 12:02
  • @Allan what I had exactly done is this: A few months ago I had an SSD installed with a optical drive caddy. So both the original HDD and the new SSD were in the Mac. The HDD eventually stopped working, so today placed SSD where the HDD was and removed the HDD completely (I also removed the optical drive caddy). This was to lower the weight of the Mac. When I switched it on after this everything was fine. Now I had the optical drive of the mac lying around, so I decided now that I'm here, I might as well put that in. So I put it in and to insert the screw I disconnected the "display" cable... – Rushat Rai Apr 29 '17 at 12:29
  • ...and plugged it back in. Everything seemed fine. Then when I switched the mac on, everything above happened. Please give me advice as to how to go about this. – Rushat Rai Apr 29 '17 at 12:30

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