Missing Wifi in iMac 2011

Question

I recently re-built the iMac 2011 by taking it all apart, cleaning and adding new hard disk and fresh install of High Sierra.

I am however unable to get any sort of wifi or even ethernet! This is quite strange! I want to know if there is a way to detect what components are attached to the iMac, like the list of components in Device Manager in Windows?

I want to see if Airport card is detected or not. I double checked the three wirings online as follows and they are attached same way using markings.

Answer 1

I want to know if there is a way to detect what components are attached to the iMac, like the list of components in Device Manager in Windows?

Yes. If you click on the Apple logo in the upper left corner of your screen, select About This Mac. You will be greeted by a new window, showing some basic information. To get a detailed list about connected components and more, click System Report. Unfold the section Hardware and you will find e.g Ethernet-cards or under Network it should list WiFi and display (in my case) an AirPort Extreme card.

If you want to read more about system report, head over to Apple support site.

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If you haven't done so, I would also try resetting SMC/NVRAM, boot in safe-mode and try the hardware test. Read more about the startup options on Apples support page.

Answer 2

The networksetup utility would be a good place to start. (networksetup -help)