Nanotechnology

Q: Ethernet "Not Connected"

I've had this issue for a while now, and  I'm running the latest version of snow leopard on my 15'' macbook pro early 2011.  When I start up my computer I would have this problem where if I don't have my ethernet cable plugged in when it first starts up it won't be recognized.  So if I go to system preferences and go to network it'll say "not connected" even though my ethernet cable is connected. 

 

This problem would only resolve if I restart the computer (I've tried logging out and into another account, etc. but it still didn't work).  I've also tried using the diagnostics assistant but it wouldn't help.  This problem would also occur say if I unplugged my ethernet cable for a bit and plugged it back in.  The computer would say it is still disconnected even though it is not.  During this whole time I would have no problem accessing the internet from wifi, unless I turn it off (then I would have no internet connection even with the ethernet cable plugged in).  I'm also wondering whether this is a software/hardware problem or has to do with the internet  modem.

Macbook Pro (Early 2011), Mac OS X (10.6.8)

Posted on Nov 9, 2011 3:52 PM

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Q: Ethernet "Not Connected"

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  • by fixleg,

    fixleg fixleg Jul 1, 2015 4:45 PM in response to Nanotechnology
    Level 1 (0 points)
    Jul 1, 2015 4:45 PM in response to Nanotechnology

    I can't believe this just worked for me.  My mac was so slow and the ethernet stopped working.  I tried many solutions.  But this actually worked!  I saw it from another user.

     

    shut down the mac

    hold down the left shift key, option and control at the same time for 10 sec.  ( i did 12 to be safe)  the computer should not turn on.

    turn the computer on and all is well with the world !

  • by jlinnnordic,

    jlinnnordic jlinnnordic Jan 24, 2016 4:41 PM in response to Nanotechnology
    Level 1 (0 points)
    Jan 24, 2016 4:41 PM in response to Nanotechnology

    I had this problem too, as soon as I plugged my MacBook Pro into an ethernet cable (which generally doubles my connection speed), I was disconnected from wifi and couldn't connect via ethernet.  I tried resetting the NVRAM (previously called PRAM) as suggested above and this didn't fix it.  So I took kostby's advice above and simply followed the instructions on the network diagnostics.  Just ended up having to switch the Configure IVp4 option to DHCP instead of manual, and then reset the DNS (domain name server) settings and now I can connect via ethernet cable again.  I really didn't do anything except follow the instructions after clicking the assist me button.  I had recently upgraded the RAM to 8GB prior to this problem, and don't know why that would have anything to do with it, but can't think of anything else I've changed.

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