iMac drops Wifi connection after 10.7.4 update

I've tried all of this, but the problem continues.

WIFI stayed connected for the past few days and just crapped out a few minutes ago.

The only way to stay connected it via ethernet.

I found how to change the channel with the router settings url you sent me. Thanks. Do you know where I could see if i am at 2.4 or 5 and change it if I have to?

If you managed to change the channel but didn't see anything about 5GHz bands, I'm guessing you've probably only got a 2.4GHz router. Google your router model/manufacturer details and see if there's anything online about it.

Hopefully you'll have solved your wifi connection problems anyway!

Hi Kris. The button in the top left corner let me view all other networks, their channels, IP's, etc.

I had exactly the same problems with all my alu iMac's 27" since 2009, and finally i solved the problem

I got the problem on all ver. of snowleopard and Lion.

Now im running OS X Lion 10.7.4

Problem:

1. WiFi suddenly drops with no reason

2. WiFi drops when timecapsule start backing up

3. WiFi drops right after wake up from sleep mode (more than 15 min.)

Only thing to do is restarting computer before i got my WiFi back!

After serval days in cooperation with a apple techinal engineer, i found the solution.

1. Go to PREFERENCES / ENERGY SAVER / COMPUTER SLEEP

2. Set the parameter "computer sleep" to anything you like EXCEPT of 15 min.

(If you set "computer sleep" back to 15 min. the problem returns)

Done

I have spend serval months on this problem and tried everything from:

software reinstall

making new account

power supply reset

hareware reset

clear all network locations

keychain resetting

You name it...

No matter what i did, it was only my imac who lost WiFi connection.

My iPhone and Macbook have been connected all the time without problems.

Hope it works for all of you?

Please let me know?

Thomas 🙂

Message was edited by: Thomazb

Apple just isn't what it used to be.. I'm having Software Update interruptions because I keep getting disconnected from the network... Remember when Apple was the easiest operating system, and things were intuitive and "just worked" every time? Sigh... I almost miss extension conflicts now...

I'll join in. My 20" iMac will not connect. It shows a wi-fi signal but I'm ****** if it will connect. Laptop, iPad, iPhone. All fine. How can I fix my iMac when I cant get the **** thing on line ggrrrrrrrrr

So true. Wi-Fi has been an absolute nightmare on my iMac. Drops out very often. My Mac Pro Westmere (10.6.8) is located as far away from the router as my house allows, and there's never been any Wi-Fi issues. What's the latest news? Is there a solution to this mess?

Thanks.

I'm 4 years into Apple/OSX. Until Lion it's been a very good experience. The Lion wifi experience reminds me a lot of Windows and the reasons that I left a Windows environment. It seems Apple wasn't thing clean or easy with Lion. It seemed to be thinking the more wholesale changes the better -- just make everything different. The notion a pad and desktop that have similar looks and feels makes liittle sense. I suggest Apple rethink the Lion direction and take another look at Snow Leopard.

FYI, we have been experiecing the same issues for quite some time. I kept attributing it to the Mindstormes online game my kids are always playing, but as this has continued to keep happening, I have finally begun to search the Support posts to see what I could find. So glad I came across this.

Model: Late 2009 27" iMac

Problem: Drops WiFi & Ethernet

Upon turning off computer, rebooting, then rebooting our DSL (ATT&T) sometimes it will recognize our WiFi/Ethernet, but mostly it will not. Currently, NOT Working again.

Also, when we try to click on the Network Connecting, it just spins and freezes, never allowing me to click on anything to make any changes. I never realized these problems coincided with the 10.7.4 update.

We have several other Apple prodects in the house which also use the DSL, they never have had an issue, including out 2006 iMac. This has strictly been a probem with the newer iMac so I new it was not a DSL related issue. In the past with I've had trouble with an iPod connectig to WiFi, I did give it a static address and that solved the issue.

Fix?

From reading these posts, it sounds like channel changing or dedicating a static address or going backwords onthe OSX update may be temporary fixes unitl ML or 10.7.5 comes out? Before I finished reading all of these posts, I went ahead and began redownloading OSX Lion, only have another 1/2 or so to wait and see if it's a temp. fix for us.

This has been such a time waste and irritation!

Thanks all for posting your comments that may help others!

Jennifer

Hi

Well, before I installed Lion 10.7.4, my imac wifi was perfect. After I installed Lion 10.7.4 package, I turned on my Imac 2011 and it didnt connect to my wifi signal. Wifi is ON, but not connect to my wifi signal automatically. I reinstall many times old version 10.7.3 but now I have the same problem.

My conclusion is that something on OS Lion is not working fine, because I have installed Windows 7 on my Imac too, and never I have problem with wifi signal, never lost my signal, and after sleep work perfect!. On OS Lion after 5 Sleeps mode, 4 didnt get wifi signal and 1 worked.

So, I hope Apple could found a solution for this problem, please.

Have a nice day.

Just spent 2 hours of my valuable time trying all these suggestions, no good, sulk. Come on Apple, get this sorted. I was going to buy a new iMac to replace my 20" one. I've put that on hold for a while. I'm sure Apple are worried sick about that. Ha

Oy! I'm glad I'm not the only one...

Just got my iMac 21" today and wifi keeps dropping.

Yes, my room is far from the main router, but I do have a repeater and tho my other devices (iphone, ipad, laptop) aren't at full bar, they're connected with no issues.

Please I hope this gets resolved soon.

I just tried your suggestion and with fingers crossed - it is working.

I offer you a very special thank you.

Let us hope it stays working.

Merci!!!