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  1. #1

    Member Since
    Jan 12, 2010
    New iMac knocking router out
    I just purchased a new iMac 21.5 late last month and since the day I set it up, I've been having issues with the wireless connection. I've seen multiple posts here on similar issues, but no consistent solution.

    My issue is that the iMac will connect to the network (full strength) and will work for 5 or 10 minutes, then begin to get progressively slower loading pages. At some point, it ends up completely taking out the router and or cable modem, so no other devices can connect to the internet without resetting the router and modem. I have multiple other devices that connect to the network seamlessly, including a MacBook and 3 Windows machines, all of which have connected in the same spot... so its not a location issue. My router is a Netgear WGT624, which again works fine with all other devices including visitors who connect from time to time.

    I've tried a host of things (manual IP, channel change on the router, upgrade software, etc.) but nothing seems to resolve the issue.

    Any help would be greatly appreciated. Connecting via ethernet isn't an option.


  2. #2

    rzj90059's Avatar
    Member Since
    Jun 03, 2009
    uMBP 2.4/4GB/250GB; iPhone 3GS
    I had a similar issue not long ago. My DSL modem would completely disconnect if I was downloading something at my full bandwidth. What I did was switch my modem to a new Netgear modem/gateway/router. That completely solved the problem. But your situation is tricky since you said your other devices work fine. Does the connection on the Mac drop only via a wireless connection or through a physical connection also?
    Tech Inventory:
    uMBP 15.4" 2.4 Ghz/4GB RAM/250 GB, uMBP 13.3" 2.53 Ghz/4GB RAM/500 GB, iPhone 4 (Black), iPhone 3GS (Black)

  3. #3

    Member Since
    Jan 12, 2010
    Yes, hard wired I'm fine. It's definitely a wireless issue and isolated to this NEW iMac. The real weird part is that it can be totally random where I've had the connection working fine for an hour, no issues and good fast response, then all of a sudden its gets slow and next thing the internet connection is dropped from the network (all machines). The other times I notice immediate issues is when the unit is fired up from sleep mode.

  4. #4

    hugtheslug's Avatar
    Member Since
    Feb 19, 2008
    Kent, UK
    2013 MacBook Air i5 13" / 2014 MacBook Air i5 11" / iMac C2D 2.16 GHz 20" / iMac G5 1.6 GHz 17"
    Hi, I know it sounds strange but Macs seem to like Channel 11 best, so try setting your router to that channel - worked for me with wireless connection issues

    Hope this helps


    A little knowledge is a dangerous thing.
    Warning - this user has only a little knowledge

  5. #5

    Member Since
    Jan 12, 2010
    started there, tried 6 then 9... all to no avail.

    Totally baffled by this whole thing.

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