I lose internet connection on iMac when it wakes from sleep

Everytime my imac wakes from sleep I lose Wi-Fi connection.  I am using OS X Mountain Lion.  Please help

You might try looking at these Apple support articles:
http://support.apple.com/kb/PH11099
http://support.apple.com/kb/PH10662 - very simple suggestions only
Here is another thread with a suggestion:
https://discussions.apple.com/message/18848093#18848093
You also might want to consider filing a feedback report. A lot of people are having similiar problems:
http://www.apple.com/feedback/
If you monitor the "More Like This" box (top right), other threads appear. Opening them usually displays other threads.

Similar Messages

  • HT1338 why do i lose wi-fi internet connection on iMac when computer wakes from sleep

    Everytime my imac wakes from sleep I lose internet connection and have to go into network and reconnect.  I am using OS X Mountain Lion software.  Please help!

    You might try looking at these Apple support articles:
    http://support.apple.com/kb/PH11099
    http://support.apple.com/kb/PH10662 - very simple suggestions only
    Here is another thread with a suggestion:
    https://discussions.apple.com/message/18848093#18848093
    You also might want to consider filing a feedback report. A lot of people are having similiar problems:
    http://www.apple.com/feedback/
    If you monitor the "More Like This" box (top right), other threads appear. Opening them usually displays other threads.

  • Wireless connection goes "stale" when computer wakes from sleep

    I have a Airport Express serving as a WPA2 wifi base station to my Macbook Pro. I set everything up so that I can get on my wifi network. Everything works fine. But then if I sleep my Macbook Pro and then wake it, the menu bar indicates that I'm connected to my wifi network, but if I try to hit any webpage or do "ping yahoo.com" from the command line, it just hangs or spins forever. To fix this, I have to unplug and replug the Ethernet line going into my Airport Express, and then turn off and then back on my Airport connectivity on my Macbook Pro. This is what it takes to get the wifi to work properly again. Does anyone know what's going on and how I can fix this?

    System Preferences>Network>Advanced>Airport. Make sure your network is at the top of the list. Delete extraneous networks from the list. Check the box, "Remember networks this computer has joined."

  • HT1338 Imac won't wake from sleep when a facetime call comes in

    My Imac will not awake from sleep when a FaceTime call comes in. 

    I've had this problem several times now, and I do no own MobileMe. I don't use any bluetooth peripherals, but I've noticed that the precursor to the problem is that my bluetooth icon in the menubar goes from normal to "Bluetooth Unavailable." Then at some point later on, I put the iMac to sleep and it won't wake up.
    I've read elsewhere that the bluetooth unavailable problem may be connected to the power management unit, which may in turn explain what is going on with it not rebooting. But I'm not sure.

  • IMac will not wake from sleep after 10.4.8 Update

    Recently after a couple of software updates my IMac goes to sleep and the Bluetooth keyboard and mouse will not wake it. The option for wake with Bluetooth is checked. I zapped the PRAM and also checked the HD, Nothing has changed. NOTE: No new software or hardware installs were done except for 10.4.8 update and the other mac software updates. This did not happen in prior versions of the OS on my iMac. Is this a new bug?
    iMac G5 1.8 (pre iSight)   Mac OS X (10.4.8)   Bluetooth, Wake from Sleep

    I've been dealing with this same issue, have tried everything, but to no avail. After MANY sessions on the phone with Apple tech support, as well as an Apple product specialist, I was advised to erase my computer and do a fresh install. I did an archive an install, which didn't help, but am not thrilled about the prospect of erasing everything and starting over. This problem started after the August 2006 round of updates. I feel it's bluetooth related, because I used a usb keyboard and mouse for a week as a test, with no problem. The funny thing is, I unchecked "allow bluetooth device to wake computer" thinking it might help, but the bluetooth devices continue to wake the computer anyway (except when it refuses to wake, of course!)
    Jerry

  • Display Changes Resolution When Computer Wakes From Sleep

    I have a MacBook Pro bought in May of 2006. In the last year, this problem has been getting progressively more annoying to me. When the computer wakes from sleep (not every time, but most of the time) the screen will flash blue, then reset the resolution to 640 x 480, I think. To fix it, all I have to do is go to System Preferences and change the resolution, but when I do that, it pops up two windows, like it thinks I have a dual display set up. To fix this, I always click 'detect displays,' and it fixes it, but the next time I wake the computer from sleep, it does it again. This isn't really an urgent problem, but I would expect my computer to behave a bit better for me.
    Thank you in advance for any aid you might give me.
    Lisel

    Hi Lisel. I have a similar age MacBookPro that does the same thing. I don't really know how to fix it I'm sorry, I wish I did cause it's annoying. I just thought I'd let you know you're not the only one with this issue.
    Basically, for some reason it thinks it has two displays connected, even when there isn't. To stop it being a total pain, make sure when it does come up with the two Display Pref windows to set them both to 1440x900, at least then when it does go dual display it won't be 640x480 and you can still read stuff.
    I've also left the Display Pref icon on the top tool bar (next to the AirPort and Bluetooth and stuff), so I can just click that and Detect Displays. When it does that it figures out for itself it doesn't actually have two displays connected and so goes back to normal.
    I know that's a workaround and not a fix, sorry. I'd be keen to know if anyone else has any better solutions:)
    Thanks,
    Mark.

  • Screen flickers when computer wakes from sleep

    O.k., so I also had this problem when I updated to 10.6.8, but it's still here in Lion.........
    When the computer wakes from sleep, I get a single flicker along the bottom 1/3rd of the screen, then everything's o.k.
    It's just annoying, that's all. I've backed out to 10.6.7 on 3 occasions, and the flicker disappears.
    Anyone else having this issue?
    I'm running a 2010 Quad-core Mac Pro with SSD and 27" Display.
    Bob.

    Update:
    I've now been to the local Apple store, and tried their display Mac Pro/27" Cinema Display combo, and guess what.......the screen flickers on wake-up.
    I asked the guy in the store about it, and he says "oh yes, I see that. No-one has noticed that before, I wonder if mine does it at home".
    I tried the Mac Mini with 27" Cinema display, and the 27" iMacs, and they were o.k. (no flicker).
    So, this only affects Mac Pro's running 2560 x 1440 resolution.
    I've booked another call with Apple Support. No doubt they'll still tell me to take my computer in for testing, even though I've shown they all do it (the guy in the Apple shop suggested that, even though I demonstrated the flicker to him on the one in the shop).
    I wonder how long this will take to get a software fix? Problem is, the Pro is not mass-market (like Macbooks and iMacs), so it may take an awful long time.
    In the meantime, I'm sticking with 10.6.7.
    Bob.

  • IPod 4G always mounts for disk use when Mac wakes from sleep

    My 4G iPod is always mounting for disk use when my Mac (10.4.8, Dual 1.8 GHz G5) wakes from sleep, even though the settings for the iPod has "enable disk use" unselected. When I launch iTunes (latest version) the iPod promptly is unmounted. I have restored factory settings, I have reinstalled the computer's OS and iTunes with it.
    What is going on and how can I make it normal?
    Dual 1.8 GHz G5   Mac OS X (10.4.8)   iTunes 7.1, iPod 4G 20GB

    UPDATE:
    I have started to turn off Bluetooth at night before I put my computer to sleep. I HAVE NOT HAD THE FIREWIRE RANDOM DISMOUNT PROBLEM SINCE. I do not know if this is a freak coincidence -- but so far, so much the better for my firewire drive.
    Hope this helps someone else down the line... eh hem...

  • 10.4.7 kernel_task eats 70% of CPU only when computer wakes from sleep.

    On my machine (FW 800), 10.4.7 caused: machine to slow perceptably after wake from sleep. Activity Monitor tells me kernel_task is consuming hundreds of times it's normal CPU cycles.
    I installed a FRESH 10.4. Imported my files and folders. Upgraded all the Apple software EXCEPT 10.4.7 combo updater. The partition worked fine, before and after sleep. Upgraded using the 10.4.7 combo updates.
    Again, kernel_task consumes 60-70% of CPU cycles after my Mac wakes from sleep. Note that it works fine when first rebooted.
    As slow as it was, it was unusable. I reverted to 10.4.6 to get work done.

    I have the very same problem on the same platform, except that I have 2 int. bootable disk drives. One boots 10.4.6 and has no problems at all. The other Boots 10.4.7 and operates perfectly, as far as I can tell from a few hours of use. It will continue to work just fine until I put it to sleep. On awakening, the Kernal Tasks CPU Usage jumps to 55% - 75% and does not decrease any further (ever). Restart or Shutdown restores perfect operation after reboot (but don't let him fall asleep).
    I have repeated this dozens of times, with identical results.
    The update was performed by the book. External devices disconnected, permissions repaired, disk verified by Disk Util. and DiskWarrior and the 10.4.7 combined update was used. Permissions and Drive Verif. was repeated after sucessful install. In my case, no other apps were effected. No Sys Errors were logged, No crash events, no Kernel Panics.
    There are thousands of Sys Config combinations involving both hardware and sotware. This looks like a flawed release on this hardware. "Updater Beware", especially the first month after a major release like this. Look for a fix very soon.
    Even so, the people at Apple have done extremely well over the last few years.
    I know, because I work with a dozen or more Generic PCs and there has never been a trouble free update from the other side.
    Having a second internal hard disk with identical OS and applications is like having a second computer in the same case. It is also a good idea to use backup software to auto-sync your user files in realtime. You can boot from one while repairing the other etc.

  • IMac won't wake from sleep since Lion!

    Since installing Lion my iMac (intel core 2Duo) won't wake from sleep properly using my wireless keyboard, trackpad or magic mouse! I haven't changed any settings and I have to hold down the power button to force shut down and then restart! Any help?? x

    Hi all
    Finally went to the Genius Bar to ask the question as nothing has worked.  They said I needed to reset my PRAM.  I did it (Following these instructions... http://support.apple.com/kb/ht1379 ) and it worked.
    So relieved....it was really annoying me. 
    Hope this helps others with the same issue.
    Thanks
    Graham

  • White iMac don't wake from sleep

    Hi,
    I have a white iMac 17" that is working very well, except for one thing: if it falls on sleep mode, sometimes it won't wake up.
    This computer had a Lion fresh install a few month ago, so I do not think it is a software issue. It looks like something hardware that makes it not wake from sleep.
    any idea what's wrong and how to repair this?
    Thanks

    10.7.3 did not cause your problem. Log into another account on your computer and see if the problem is replicated. If you don't have a second user account then create one. If the problem isn't replicated then you have a software problem that you need to track down in your normal user account.

  • Macbook loses internet connection every time it is put to sleep

    every time i open my macbook pro from sleep mode there is no internet connection, even though my wifi bars are full and black and my home router is found and ticked. after a 1-2 minute delay my mac then connects to the internet. this happens every time i open my laptop from sleep mode.  i have to wait 1-2 mins. this has only started to happen in the last few days and is driving me mad as it shows it is connected to the internet. any ideas ?
    thanks

    Delete the network from your macbook, system preferences, network, select advance tab and delete it
    Then Re join the Wi-Fi network you want.

  • HP 250 G3 can not connect to modem when it returns from sleep

    Hi, Ralink RT3290 Wifi adapter driver is loaded on my HP 250 G3. I can connect modem and internet. I can download and upload data from internet properly. However, if I put my PC on sleep, after waking up, PC cannot connect to modem.   At every turn, to solve this problem, I turn off and turn on wireles adapter. Then, PC can connect modem and work properly.  How can I solve this problem. Is there any problem on my wifi driver or something else? Please help me.

    Thanks. How long is the delay?
    I've had that on my Late 2007 MBP since Day One but the delay is usually only seconds--no more that three on a bad day.
    I think its to do with waking from sleep. The standard sleep mode in the MBP is :Safe Sleep" where the computer writes the contents of RAM to the hard drove before sleeping as a safety net against the battery running dry while the computer sleeps. If the computer has to read this spot of info before completely awaking.
    When I first purchased my MacBook Pro, a month ago, it would connect immediately upon waking from sleep. Now, for some unknown reason, it will not
    That could be the result of now having more to write before sleep than when the computer was new because it's been in use a while and had other software added. For a test, see if the delay is reduced if you quit all open apps before sleep.
    Having  DashBoard active could also be a contibutor becasue many widgets have to "phone phone" for updates and could be preempting the connection opening for regular use. I use this widget:
    http://www.apple.com/downloads/dashboard/status/dashquit_berenguierduncan.html
    to shut down Dashboard without having to restart the computer. It's a carry-over from the old days of slower computers and expensive RAM but i find it still useful. This does not harm Dashboard or make if unavailable later. It 's basically the "off switch" that DashBoard should have been granted.
    If, after quitting active programs and Dashboard, the delay is still more than a few seconds, then something else is at play. As the computer is new and under warranty, I would let an Apple Store look at it.

  • Macbook pro tries to connect bluetooth keyboard when waking up from sleep

    I have a 2012 Macbook pro and it is trying to connect to a bluetooth keyboard when I wake it up from sleep. The computer freezes while it is searching for the keyboard and only works properly once it discovers there is no keyboard connected. I have never used a bluetooth keyboard and I currently have my bluetooth switched off.
    Doe anyone have any idea how I might stop this from happening? It can often freeze for quite a while, which can be very frustrating.

    I have the exact same issue. MacBook Pro Mid 2012. OSX Yosemite 10.10.2. Mine is actually brand new.

  • My computer displays a blue overlay over my log in screen when I wake from sleep. How do I avoid this?

    My Macbook Pro (late 2012) recently started making a weird startup noise coming from the optical drive and displaying a blue overlay screen with a bar at the bottom when waking from sleep, after about 2-3 hours of non-usage. It then takes about 30-45 seconds until I can type in my password. When I first got my computer, this wouldn't happen.
    Any idea why it does this and how I can stop it?
    This is a picture of the screen:
    Message was edited by: ekom
    (I did click the camera icon to add the picture the first time. I tried it again.)

    If you want to post an image please use the Camera icon in the message composition window's toolbar. You cannot just drag one in from your computer, hence why your image does not appear.
    I would suggest you try this:
    Reinstalling Lion/Mountain Lion Without Erasing the Drive
    Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
    Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
    When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
    Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button.
    Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

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