'Self Assigned IP Address' / Mid 2011 iMac / Fresh Yosemite 10.10.4 Install

You saved my life. I agonized for hours and couldn't understand why all other devices in our household were able to flawlessly connect, just not my iMac. Then I tried what you wrote (set the router to 11bg-mixed and since then it works like a charm. :-)

You have 90 days of complimentary AppleCare, give them a call. Complimentary AppleCare Support

This is one of the problems I really hate dealing with. I’ve developed a standard method which includes a large amount of four letter words. I’m not positive they are a required part of the process but they seem to help 😁

Having determined that your computer’s WiFi works means we can move on. First, go online and make sure your router has the most current firmware. If it doesn’t, install and try again. Second, temporarily disable security. After the router has shut down your computer and restart it. (Don’t just reboot, this seems to be as important as the 4 letter words and for sanity’s sake you might want to turn off or put to sleep all your other Internet using devices before you turn the router security off.) If it connects now turn the computer off again, turn security back on, and try again.

Then, as rkaufmann87 suggests, call Apple.

xx-Lotus-xx wrote:

hmm this is a mid 2011 iMac.. I think the apple care is out of date?

Anyway, I did call them and got some help.. They have told me to contact TP Link and ask them if they know what the problem could be.. a TP-Link W8970 Router & iMac Mid 2011 incompatibility issue? hmmmmmm :/

You didn't mention it was a used Mac. One thing to do is re-set the modem and ensure it has up-to-date firmware. If it still will not work, consider dwb ideas and if all else fails, replace the router with something like an Airport Extreme.

Good luck

Hey Lotus,

I've been through your stage and i was depressed and annoyed with my Wi-Fi connection. I did some research and came up with the best solution:

go to the /Macintosh HD/Library/Preferences/ folder (you may find Macintosh HD from spotlight search bar) and remove the file called "com.apple.alf.plist," and then restart your computer. After the system boots, you may be prompted to allow incoming connections to numerous programs and services, so accept these. As simple as that 🙂