Intel Mac :: Why Does It Sometimes Use 100% CPU (kernel_task) And Lose Internet Connection
Jun 24, 2012
I have a 27" iMac running OSX Lion 10.7.3. Some time in the last 2-3 weeks, it has started to getting into a state where the kernel_task is using 100% of one CPU constantly. When this happens, it also kills my Internet connection and I cannot use the browser, email, Skype, Twitter, etc. I have tried putting it to sleep, closing all programs that are open checked the process list with ps to see if I could find anything weird, but it still keeps happening.Â
I have to restart the computer whenever this happens. It might happen again in a couple of minutes or not for several hours, but happen it does. I thought it might be Chrome or Mail for a while, but it happened today when those were not running.Â
Info:
iMac, Mac OS X (10.7.3)
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Apr 21, 2012
Ever since I upgraded to Lion, my imac loses its wifi connection when it sleeps.When i wake it up i have to always go up to the wifi icon on top right of screen and wait till it sees my network and then say connect.This never happened in snow leopard, seemed to stay connected.
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Mar 24, 2012
I have a new MacBook Pro and use it at work. I need to have it connected to the internet (wireless) even when it's closed or I lose the connection and have to log in again when I re-open it... can that be done?
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Apr 23, 2012
why does my imac lose internet connection after coming out of sleep mode and sometimes from power up. This is something that started about ten weeks ago.I have been all though road runner's diagnostics and etc. So now they insist that its with my imac.
Info:
iMac, Mac OS X (10.6.8)
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Jun 1, 2014
There's something wrong with the Wifi connectivity on my Macbook Pro. Every few minutes, I lose connection to the internet even though it says I'm still connected to my network. I have to turn Wi-Fi off and then on for it to start working again. It only works for a few minutes and sometimes hours, but then I have to turn Wi-Fi off and then on agian. It only happens on my MacBook.
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Mar 23, 2012
I connect with my MacBook Pro via ethernet to the internet. So far, I've never had a problem until a couple of days, I keep on loosing the internet connect. When clicking through diagnostics, ISP, Internet and Server show first organge then turn red. If clicking through the diagnostics, sometimes I am lucky and it shows a message saying "Network configurations have chnaged", when I click ok, I'm online again. But very often nothing helps and I have to re-start the router again.
Info:
Mac Pro, Mac OS X (10.6.8)
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Jun 26, 2012
Everytime I turn on the computer, there is no wifi connection. The symbol is still at the top of the screen, but is gray rather than black. I can click on it and it gives me the choice of my network or a neighbor's. All I have to do is click on mine and it connects.Â
Info:
iMac, Mac OS X (10.7.4)
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Aug 17, 2009
I have two iMac's (an old G5 and a newer Intel iMac -- about a year old). On both I have been using Apple's bluetooth keyboards and mouses with no problems. Recently (maybe when I updated to 10.5.8), the mouse behavior has been problematic on both machines. On the Intel iMac, the mouse and computer will lose the connection several times a day. I'll command-tab from application to application and then after a while connectivity returns -- until the next time. The behavior on the G5 iMac has been much more problematic. On that machine, the mouse only occasionally works.
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Mar 21, 2009
I just purchased a new iMac 24" 2009 Model. I also got a Wireless Mighty Mouse & Wireless keyboard. I have owned the system for 6 days and each day the Mighty Mouse and keyboard will lose connection and require me to hold the power button down on the imac to restart the system. I called apple and was told to do a "Option Command R P" Reset. This did not fix the problem... I then called them again and was told to format the system.. This did not fix the problem.. I replaced the batteries, turned bluetooth off on any near by devices changed my 802.11 freq to a different channel. It seems from information collected from other forums that this is effecting mainly the new alum 2009 imac...I am starting to think this is now hardware. Also something I noticed.. Brand new FRESH Energizer Ultimate Batteries $25. I put them into the mighty mouse. 1 day later iStat reports the mouse is at 73%!! thats a big drop in 1 day
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Mar 28, 2012
My iMac keeps dropping internet connection. This has only been a problem since installing Lion, it often tells me there is no connection when my iPhone and MacAir work perfectly so i know its not the broadband itself. I also get the message that my network configuration has changed.
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Apr 26, 2012
why my new iMac internet connection is so slow on one of 4 computers on my network?
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May 1, 2012
Keep losing the internet signal on my new i mac
Info:iMac
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Jun 8, 2012
My iMac keeps losing conection to the internet! It is so annoying! What my supposed to do?
Info:
iMac, iOS 5.1.1
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Jul 6, 2012
I have an iMac (without an Airport Base). It is connected to a Sky router through an Ethernet cable but still with wireless capabilities. The internet connection keeps dropping out at regular intervals throughout the day to the point that my partner may just throw it out the window! The router lights still show it is connected as does the wifi signal at the top of the screen. Our iPhones still work even when the Mac drops off.
Info:iMac, Mac OS X (10.7.4)
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Mar 13, 2012
Recently just switched from 16mbps to 100mbps internet connection. Internet is connected tru Wifi and max speed i get is nothing more than 15mpbs and if connected through ethernet ill get speed more than 80mpbs. How to acheive 80-100mpbs tru Wifi? Called my service provider and reason given was that my network card doesnt support or its an old network card but my iMac is new
Info:
iMac, Mac OS X (10.7.3)
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Mar 19, 2012
Since last week my iMac (Early 2009, OS 10.7.3) has been dropping its connection to the Internet. I'm using a router connected to an Airport Extreme and connect to it via WiFi. I tried connecting via Ethernet cable from modem to iMac but it would drop the connection entirely, which is why I had been connecting via WiFi. I have no problem with my other devices (iPad, iPhone and MacBook, this one with 10.7.2 installed), they connect immediately to the Internet and all, even the iMac, are able to connect to each other.Â
I already tried restaring the Airport Extreme, zapped the PRAM, reset the SMC, repaired permissions, disconnected the router and Airport from the power source and it still won't connect. Last time this happened, my iMac went to sleep and dropped the Internet connection after waking. I put it back to sleep and woke it using the power button as someone had suggested in another post, that helped and the connection was reestablished. This morning the iMac it was working fine, did not go to sleep at any time and suddenly dropped the connection, which I haven't been able to restore since.Â
Info:
iMac, Mac OS X (10.7.3), 24-inch, Early 2009
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Apr 14, 2012
My iMac is connected to the internet wirelessly.
Every hour (or even more often), I get the message "Safari cannot connect to the Internet", followed by a prompt to run diagnostics. I run the diagnostics, re-select my network (provided via BT Hub) and pronto - the issue is fixed, by why does the connection drop so often. Surely this can't be right - I can't be doing that every time I want to go online. Â
Interestingly, my iPad (which uses the same network and Safari) never drops the connection, so it is something to do with the iMac.
Info:
iMac, Mac OS X (10.7.3)
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May 1, 2012
I'm newbie an just using apple the first time in my life. I bought imac i5 2.7 ghz..Can someone help me about my problem? I already check with my inet provider that my connection got no problem at all. But i felt that it is slow and the worse case again when back to my old windows notebook, i got no problem with the connection. The imac performance itself got no problem.
Info:
iMac, Mac OS X (10.7.3)
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May 18, 2012
My internet connection has always been very fast and I have never had any problems with its speed or loading of web pages. Over the last two day I have experienced extremely slow connection speeds and webpages have been taking forever to load. Is there a setting I can check or cache to empty to help speed up my connection? Or is there a disk cleanup to help get rid of whatever may be causing this problem?
Info:
iMac (21.5-inch Late 2009), Mac OS X
(10.6.2)
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Jun 8, 2012
I am using an IMac connected to the internet via wlan. While my windows laptop which is connected to the same wlan has no problem, the imac connection to the wlan is very unstable. Working online is thus a problem.
Info:
iMac (27-inch Mid 2010), Mac OS X (10.7.4)
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Jun 11, 2012
Why does my Mac keep losing internet connection every 5 minutes - I end up having to turn wifi OFF and ON again each time.
As all other devices in the house connect seamlessly to the wireless router, the problem is only with my MAC desktop.Â
Info:
iMac, Mac OS X (10.6.8)
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Jun 27, 2012
I have a new iMac and Att DSL modem. With a wireless connection, the modem is dropping the internet connection after about 5 minutes.
Info:
iMac (21.5-inch Mid 2011)
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Jul 3, 2012
my internet connection drop intermittently. How can I diagnose and fix this?
Info:
iMac, Mac OS X (10.7.4)
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Jul 5, 2012
I am having trouble with the ping speed on my internet connection; it is registering at 174 ms, which is too high. My iMac is a 2009 24inch model running Lion. Is this due to my wifi or is it the ip server?
Info:
iMac, Mac OS X (10.7.4)
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Jun 21, 2010
I have two identical iMacs hooked up to a router. Both had no internet connection problems until now. One iMac works fine, the other just stopped. I swapped LAN cables and router ports but the iMac that quit connecting still won't connect.
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Feb 15, 2012
My internet keeps losing signal and will have to reset the internet on the computer, we thought it was but have changed to sky now and it still happens.
Info:
iMac, Mac OS X (10.7.2)
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Mar 3, 2012
I do not have a problem with the Internet while I am using the system. However, when I wake the iMac up in the morning, there is no Internet connection.I have to use System Preferences/Network/ and select the network.iMac / Intel / Mac OS X version 10.7.3
Info:
iMac (21.5-inch Mid 2011), Mac OS X (10.7.3)
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May 13, 2012
When I am on the internet, I am constantly losing connection.
Info:
iMac
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Jun 3, 2012
Iimac uses airport extreme. For no known reason stopped connection to Internet. Reset. Still no connection with saying cannot connect because it timed out. When I connect extreme directly to the iMac I can get Internet. If I disconnect Internet does not work
Info:
iMac, Mac OS X (10.7.4)
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Jun 24, 2012
Just got a new iMac and when I use safari, my connection is VERY slow. I have my old imac and other NB's running on the same home network and they work very fast and work fine. my new imac seems to show the address it's going to but sits there for literally min's before it connects or if it connects.
Info:
iMac, Mac OS X (10.7.4), 2,7ghz, 4gb, 1333 mhz, ddr3 4gb
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