27"iMac (mid 2011) wifi won't wake up from sleep

Question

Level 1

19 points

27"iMac (mid 2011) wifi won't wake up from sleep

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)

Posted on May 12, 2011 8:48 PM

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Answer 1

Eric Ross

Level 6

11,807 points

May 12, 2011 10:06 PM in response to Npalamidis

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.

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Answer 2

Npalamidis Author

Level 1

19 points

May 12, 2011 10:10 PM in response to Eric Ross

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!

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Answer 3

wifiguru

Level 2

240 points

May 12, 2011 11:55 PM in response to Npalamidis

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 ?

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Answer 4

freemem

Level 4

1,900 points

May 13, 2011 12:25 AM in response to Npalamidis

Greetings,

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.

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Answer 5

Npalamidis Author

Level 1

19 points

May 13, 2011 8:49 PM in response to wifiguru

Hello,

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!

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Answer 6

Npalamidis Author

Level 1

19 points

May 13, 2011 8:50 PM in response to freemem

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!

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Answer 7

Kricki

Level 1

0 points

May 14, 2011 12:12 AM in response to Npalamidis

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...

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Answer 8

Npalamidis Author

Level 1

19 points

May 14, 2011 5:48 PM in response to Kricki

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

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Answer 9

Kricki

Level 1

0 points

May 15, 2011 8:59 AM in response to Npalamidis

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

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Answer 10

Npalamidis Author

Level 1

19 points

May 15, 2011 9:15 AM in response to Kricki

@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 !

Nicos. 😎

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Answer 11

Kobes

Level 1

5 points

May 20, 2011 4:20 AM in response to Npalamidis

+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...

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Answer 12

Npalamidis Author

Level 1

19 points

May 25, 2011 9:50 AM in response to Npalamidis

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

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Answer 13

May 25, 2011 5:44 PM in response to Npalamidis

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....

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