WiFi disappears after 10.7.5 update on iMac

Yes, I am sure. I tried everything short of reinstalling the OS completely. I took it to the store, it worked fine with the Apple router. I took it to a friends, it worked well with their router. Also, while I was having these issues, I noticed that half of the typical routers found in my network lists (neighbors, etc) were not there. I confirmed with one neighbor who is directly across the courtyard they have a Netgear router too. As soon as I updated the Firmware, deleted those files, updated the security, changed a channel, and created a new location I started getting extremely fast speeds. Still working for me exactly a week later. I just updated the software again. There's a 10.7.5. fix.

I would call Apple Care as soon as possible. Once you get passed the verification department, tell the Apple Care support rep to transfer you to a "Wi-Fi specialists" (next tier level). They are very very helpful!

There is also a new update "fix" to 10.7.5

I had this problem for a couple of days now with dropped wi-fi connection from sleep on my iMac. I have a Netgear router DG834. I upgraded the router firmware to V5.01.16 and this solved the problem.

Also, went to my local Apple store where the 'specialist' didn't have a clue what I was talking about!! Have to agree that all these issues are beginning to sour Apple's products.

Hi,

I had the same problem,

I tried most of all solutions given in this post, but none of them worked. I finally solved the problem.

I'm using a Freebox HD (which is the router) and in my original parameters : channels on the wifi configuration were automatically chosen.

So I unchecked this and I manually chose the channel 1, restart the freebox and Voilà... Problem solved.

For this :

1) Go to your freebox Parameters panel : https://subscribe.free.fr/login/

2 ) Go to "My Freebox" / "Wifi Parameters" / Wifi Canal

3) Uncheck automatically and choose the channel 1 (you can also try the 6 and the 11)

4) Restart your freebox and "Voilà!!"

What is strange is this paramater (Automatic channels) on the router never disturbed my wifi connection before the update 10.7.4 (& also 10.7.5)

Hope this will help some of you maybe on other brand routers !!

I have a 2008 MacBook Air . I upgraded last week to 10.7.5 to be able to install FileMaker Pro 12. I have gone 5 days with Internet, today I tried to connect and was given the" no hardware installed " message for wifi. One of the posts below said to start up in rescue mode and the hardware would be found Not so.. I have a linksys router in WPA personal I believe on channel 9. My husbands iPhone 4S also lost all connectivity to all wifi this week. Our tv, iPad 2, iPod and iPhone 4 still connect.. This is not a happy day.. I really ca not downgrade but I need Internet .. What to do?

Thanks in advance.

After calling Apple and doing a number of resets, the end result and fix for me was

Intel-based Macs: Resetting the System Management Controller (SMC).

This worked we will see how long.

Jenna