Previous 1 9 10 11 12 13 Next 234 Replies Latest reply: Feb 13, 2014 7:17 AM by Bikermanjohn Go to original post Branched to a new discussion.
  • arncowife Level 1 (0 points)

    I was having the same problem since I loaded ML on my iMac.  However, I did the following and it has been running without any wifi signal dropping at all.


    System preferences

    Energy Saver

    Computer Sleep - Put the selection to Never.


    For me, this has seemed to fixed the problem.

  • philkdc Level 1 (0 points)

    Please confirm that you were having wifi drops with Mountain Lion.

  • arncowife Level 1 (0 points)

    Yes I was having wifi drops with Mountain Lion.  But since I made the change to the energy saver settings, I haven't had any additional problems with the wifi dropping.

  • mfaisal Level 1 (0 points)

    Read through the whole thread from Feb 2012. As with everyone, here are the parameters of my problems:

    a) bought my imac in Sep 2011 (upgraded to OS X Lion on same day) - 27 inch.. (theres two, one high end one lower end, mine is the lower end)

    b) started to get intermittent wifi connection. As with some people here, happens once every 30 minutes or so. Wifi logo thinga-ma-jig shows its connected to wifi, BUT theres no internet connection. solved by turning wifi on and off,  but problem would persist every 30 minutes or so.

    c) definitely not a hardware problem (sorry for stating the obvious) because i run bootcamp for my library of steam games. my windows 7 does not disconnect AT ALL. its sad that in terms of wifi, windows works better on iMac than the Apple software itself. Apple, please hang your head in shame.

    d) updated to ML last night. used it for about 30 minutes, and lo and behold, the intermittent connection is still there and its still a problem for me.

    e) i havent tried any of the fixes:

         1) change the airport channel

         2) change the sleep timer to something else than 15 mins

         3) various other fixes that people have listed here, which means ill have to go back and reread and try everything. will update you guys on any developments.

  • philkdc Level 1 (0 points)

    Sorry to hear about your experience.  But appreciate you sharing.  It seems that some have had success with the ML OS X update.  I have not installed it and I'm debating what to do because Lion was a negative experience.  The main fix for me was changing to WPA from WEP router security.  That made a big improvement in connectivity.  But there are still intermittment drops.  I have a MacBook and Windows laptop on the same network that have no wifi drop problems.

  • fredges Level 1 (0 points)

    Argh! I just spent nearly an hour creating an ad on craigslist, and when I hit "continue" my wifi had dropped, so I lost all my work! This is now officially  r e a l l y   p i s s i n g  m e  o f f.

  • BobRooni Level 1 (0 points)

    Here's something insane that I found. (after lurking on this thread for 2 months due to bad wifi on my macbook pro running 10.7.4) I haven't found this tip on ANYWHERE else and have NO IDEA why it would work... but it did!


    "I tried put an 0x in front of my password (I have a WEP protected router) and instantly it worked when nothing else did. I had tried turning air port on and off, resetting the router, changing my IP address and configuring everything manually, deleting certain suggested files in my system configuration, still no internet connection."

    -- mation_mark.html


    I was 100% skeptical too, but I tried it and it worked!


    ...for now. Try it out! And tell me if it works for you too... and if you could explain WHY the **** it works I'd appreciate that too.

  • Fredcuthb Level 1 (0 points)

    I was having a similar problem.  After trying everything I could think of it occurred to me that the trouble might be due to interference.  I have two Wi-Fi routers.  The second wireless router shared a power source with a recent addition on the power line of a "Sling something" provided by the satellite TV provider.  Once that was unplugged my problem was over.



  • fredges Level 1 (0 points)

    Ok, I'm officially DONE with this iMac. Returning it to the Apple Store tomorrow. Wifi is dropping left and right now, and though I have two iPhones, three Apple laptops, and an old G3iMac in the house that are all connected and behaving perfectly, my new (Dec. '11) iMac now cannot even SEE the network... I have to shut off Airport three  times and wait for the network to pop up... I can see all my neighbor's Windows networks, though... lot of good that does me... SICK of this. Can't browse the web, can't send an email, can't post anything on craigslist, and can't share files with my other machines. What an expensive piece of junk.


    OMG, as I typed this I lost me network connection!!! Hilarious!


    "WiFi: Looking for Networks..."

    "WiFi: Looking for Networks..."

    "WiFi: Looking for Networks..."

    "WiFi: Looking for Networks..."

    "WiFi: Looking for Networks..."

    "WiFi: Looking for Networks..."

  • philkdc Level 1 (0 points)

    Apple Store hasn't been a great deal of help on this issue.  On my 2010 iMac they said they could not replicate the problem and then reinstalled an older version of Lion.  Would be interested to know how they respond to you.

  • philkdc Level 1 (0 points)

    The reinstallation did not address the problem.  All this after they had the machine for two days.

  • bobinramsey Level 1 (0 points)

    I keep reading all of these posts and am amazed. I had a problem the after the Lion upgrade that if my iMac idled for a few hours, it would drop its wifi connection. Never had to reboot or anything, just had to reconnect to my wifi network. Not a big deal, but a hassle. So I posted here seeing some answers. This was a couple of months ago. Read all kinds of horror stories including having to restart the Mac, wifi dropping while surfing -- none of which had I ever experienced. Read a few things and changed the 'radio channel' of my connection and problem basically went away. Last month I installed ML and have not had the problem since. All of these people, with all of these problems -- wondering if they are doing something in their set up/configuration that 'self inflicts' these problems. Otherwise, why wouldn't I be experincing them? Just a thought. I no longer have the problem, so am bailing from these discussions.



  • philkdc Level 1 (0 points)

    If you read through the posts you will note that one pattern is that the symptoms of wifi drop vary among users in this forum.  That could mean there is more than one problem, the problem has different symptoms with different hardware configurations, or any number of possible explanations.  But at this point even Apple acknowledges that Lion has issues with wifi.

  • fredges Level 1 (0 points)


    How do I change the radio channel? That would be good to know. I'll give it a try! Thanks!

  • fredges Level 1 (0 points)

    I stumbled across this today, perhaps it might help? (thanks to smalldog!)


    Wifi diagnostics tool:


    This tool is available for anyone running 10.7 or later. The tool is slightly different for Lion users than it is for Mountain Lion users. If you’re running Mountain Lion (10.8) hold down the option key on your keyboard and click on the Wi-Fi icon in your menu bar. It’s the one that is pie wedge shaped. You’ll see a menu item called “Open Wi-Fi Diagnostics.” If you’re running Lion you’ll need to navigate to it manually by going to the following folder: /System/Library/CoreServices. As with most applications you don’t want to move it from it’s original install location, so do not move the application from that folder! If you want to make a shortcut to it to keep somewhere else that’s fine.

    If you’re on Mountain Lion press Command+N to open a utilities window and then click on “Wi-Fi Scan.” For Lion users you’ll want to use the Monitor Performance tool. Both will give you the list of available networks as well as their signal and noise information.

    Here’s some information from Technorati on how to tell if you have a good signal:

    “The ‘Signal’ number specifies the signal strength between your Mac and the Wi-Fi access point or router. The higher this number is, the better. But note that these are negative numbers so a Signal of -60 is higher (and stronger) compared to a Signal of -80. The Noise number represents the amount of wireless noise that can interfere with the Signal. In this situation, we want lower numbers. So again, because we have negative Noise numbers, a Noise level of -94 is better than one of -90.

    Finally, we can take the Signal and Noise numbers to come up with a Signal-to-Noise ratio (SNR) for our wireless connection. So for example, If I have a Signal level of -60 and a Noise level of -91, the difference between these two numbers is 31. The higher the SNR is, the better the Wi-Fi performance will be. Typically a SNR of 25 or higher will give you great Wi-Fi performance.”

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