Previous 1 2 3 Next 32 Replies Latest reply: Jan 26, 2013 11:34 AM by Spydereleven
skyofblu Level 1 (0 points)

My Mac Pro will not connect to the internet, but it connects to Wifi via my comcast modem.


the modem was switched out today, but I couldn't connect before that - which is why they came and replaced my modem.


The lights in the Diagnostics window say:


Ethernet: connected


Wifi: connected


ISP: Fail


Internet: Fail


Server: Fail


Any ideas?

Mac Pro, Mac OS X (10.7.5)
  • Linc Davis Level 10 (192,365 points)

    Don't try to connect to the same network with Ethernet and Wi-Fi at the same time.

  • skyofblu Level 1 (0 points)

    I didn't. I turned the wifi off while trying to connect to Ethernet. Any other suggestions?

  • Linc Davis Level 10 (192,365 points)

    I'm not sure I understand. You couldn't connect to the Internet, so Comcast came to your premises and replaced the modem. Did the technician test the connection? Were you ever able to connect through the new modem, and if not, what did the technician or Comcast support tell you?

  • skyofblu Level 1 (0 points)

    Internet was not working. Comcast came and replaced the modem. The computer connected via wifi but not via ethernet.


    The comcast guy said it must be settings in my computer that are not set properly and that I had to call tech support. Tech support said it must be that my computer is not functioning properly. (after we tried all kinds of cable switches, settings, etc.) Tech support was not entirely mac savvy.


    Now I'm resorting to this board to prevent me from having to take my computer to the genius bar.


    Any ideas?

  • Linc Davis Level 10 (192,365 points)

    When Ethernet is connected, is it at the top of the connection list in the Network preference pane? If not, move it to the top and Apply the change.


    When it is at the top, select Advanced TCP/IP. What values are shown for the following:


    Configure IPv4

    IPv4 Address

    Subnet Mask


  • skyofblu Level 1 (0 points)

    When I turn off wifi, Ethernet goes to the top of the list.


    The following are listed in the TCP/IP tab:


    Configure IPv4 - Using DHCP (selection in dropdown)

    IPv4 Address - Nothing showing

    Subnet Mask - Nothing showing

    Router - Nothing showing


    btw, I tried clicking Renew DHCP lease but nothing happened. Also DHCP Client ID: is empty, but so is the one on my laptop when ethernet is connected.


    Also says -

    Configure IPv6: Automatically  (in dropdown)

  • Linc Davis Level 10 (192,365 points)

    What do you see when you're connected via Wi-Fi?

  • Grant Bennet-Alder Level 9 (56,565 points)

    Close that window and save changes, then re-open it.


    Any Address showing for IPv4 ??


    If nothing, many people have success by using the ( Assist Me ) button, choosing Assistant, and setting up their Ethernet from scratch, including a new "Location" (not just modifying the existing one).


    DHCP Client ID is seldom used, and not required for your setup.

  • skyofblu Level 1 (0 points)

    Sorry guys, I was finishing up a contract then holidays, then flu.


    So, Thank you so much for your advice. I was on the phone with Apple for 1.5 hrs. one day. They did many tests and told me it was my router.


    Called Comcast again. they came the same day, replaced the router, and the tech brought his laptop. He could connect just fine, but my Macpro can still only connect via wifi - no ethernet.


    Completely annoyed, I searched for others having this issue, and there are many pages of posts about this same problem on minis, macbook pros and mac pros plus some connection to Thunderbolt. Looks like there might be an issue with 2010 issue computers.


    Here are some of the threads. So apple knows about this. They just don't care or haven't fixed it yet. after-waking-from-sleep/


    Guess I'm stuck with this - which totally ***** cause video is hiccuppy on the wifi.

  • Linc Davis Level 10 (192,365 points)

    Did you try the steps suggested in those threads?

  • skyofblu Level 1 (0 points)

    Every one - nothing fixes it.  Tried them on my own, then those plus other options on the phone with Apple.


    Very frustrating.

  • Linc Davis Level 10 (192,365 points)

    Boot into Recovery by holding down the key combination command-R at the startup chime. Release the keys when you see a gray screen with a spinning dial.


    Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with proxy servers, or with networks that require a certificate for authentication.


    From the OS X Utilities screen, select Get Help Online. A clean copy of Safari will launch. No plugins, such as Flash, will be available. While in Recovery, you'll have no access to your saved bookmarks or passwords, so make a note of those before you begin, if they're needed for the test.


    Test. After testing, reboot as usual and post the results.

  • skyofblu Level 1 (0 points)

    I did this with the apple tech, and that is when they decided something was wrong with my modem - which was untrue cause my work laptop connected just fine with the same cable (to ethernet).


    I'll do it again and let you know what happens.

  • skyofblu Level 1 (0 points)

    Booted into REcovery.


    Repaired disk. Then Repaired Disk permissions.


    Rebooted. Same result. Ethernet will not connect.

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