Previous 1 2 Next 21 Replies Latest reply: Jul 30, 2011 5:12 PM by garynfromaustin
Npalamidis Level 1 Level 1

I have been using my brand new core i7 27" iMac for the last week! And I have noticed a wifi bug that's driving me crazy!


Everytime my iMac goes to sleep when I wake it up the wifi won't detect any networks at all. It's just like if the wireless card is still sleeping! At first I waited for a while because I thought it would take longer to wake up! But it never detected any networks at all.


If I manually turn the wifi Off and then turn it back ON then  it detects my network and all the wireless networks around with any problem.


My home router is an Airport Extreme Dual Band !


Is anyone out there having the same issue?  or could it be that I got a faulty airport extreme card in my iMac??

iMac, Mac OS X (10.6.7)
  • Eric Ross Level 6 Level 6

    Go into your system preference and click on Network then click on AirPort click on the advance button (bottom right) when the window opens make sure AirPort tab is selected then verify the check box "Remember networks this computer has joined" is checked.

  • Npalamidis Level 1 Level 1

    It's already like that!  I believe it's a bug of Waking up the wireless Card!  Because with just turning the wifi off for and then on Manually. The imac automatically detects all the networks without problem!


    Thanks for your idea anyway!

  • wifiguru Level 2 Level 2

    What signal strength is the iMac seeing the wireless network at ? Option click on AirPort Menu Extra and note down the RSSI value. A value between -35 and -74 is usually good. Anything lower could cause issues.

    What channel is the wireless network on ?

  • freemem Level 4 Level 4



    if possible you can try to set your airport to bridge mode, if this helps it might be a case of having 2 DHCP services available (airport + adsl modem), which does not always work flawless.

  • Npalamidis Level 1 Level 1



    My router is 3 feet away from the iMac. At this moment the network is on channel 149 with RSSI -42 .


    I'm almost 100% sure that is a wake up issue of the iMac's airport card. Because with just turning it on and off the imac connects immediately no questions asked!

  • Npalamidis Level 1 Level 1

    No Just 1 router close enough to have priority and it's the only router the iMac is paired with. There are other neighbors wireless networks but I'm not connected to any of those!

  • Kricki Level 1 Level 1

    I am facing a comparable problem which is even worth. The iMac permanently drops the WLAN connection if there is no internet acitivity after approx. 30 seconds. A real nigthmare...


    The router, the location or other issues in my sphere can't be the cause as I run various other Apple divices like MBP's, iPhones, iPads and an other iMac in the same environment.


    If you search the forum you'll find a lot of people facing WLAN problems with the new iMac (May 2011 refreshment).


    It looks as if we are facing a serious bug with the new iMac...

  • Npalamidis Level 1 Level 1

    hopefully they correct this wireless bug soon! I'm sure we'll see a driver upgrade soon!

  • Kricki Level 1 Level 1

    Hi Npalamidis,


    finally I solved the problem by changing the channel in my router manually - that's all!


    I would never have considered so because my iMac late 2007 which was replaced by the new iMac worked at the same place and with the same router without any problems.


    By chance I found a general hint to do so in a forum...


    However - the story remains strange and if you do not have at least a minimum of computer knowledge you are totally lost!


    Hope, you get your problem solved as well!


    Greets, Christian

  • Npalamidis Level 1 Level 1

    @kricki changing the channel worked for me to connect to the 5 ghz network.  But I still have the wake up issue !!


    The channel setup should be automatically ! That should be done automatically, just like in your previus iMac.


    I hope apple is working on a Driver or Firmware update !



  • Kobes Level 1 Level 1

    +1 on the issues, using a 27" mid-2011 iMac connected to AExpress (802.11n).

    Manually changed the channel, hoping for the best.


    I also sent an email to apple feedback. We'll see, hopefully the update will arrive soon...

  • Npalamidis Level 1 Level 1

    This problem is driving me crazy! I Hope apple releases a FIX SOON!

  • deschaefer Level 1 Level 1

    Same here..  every time it wakes, I have to reconnect.


    My network is not public, not sure if that is related tot the issue.  My old imac works fine with the same configuration as well as other wifi products....

  • ATAMAH Level 1 Level 1

    I have the same problem. Sometime the wi-fi connection freezes and internet doesn't work in the new iMac 21".

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