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iMac Won't Shutdown - Ethernet & Airport Not Working

 
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Dino1956
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PostPosted: Wed Feb 04, 2015 10:35 am    Post subject: iMac Won't Shutdown - Ethernet & Airport Not Working Reply with quote

So my Intel 3.0 2009 iMac kept disconnecting from Internet. First thing I thought was my AT&T Modem was dying again. After extensive trouble shooting, I found out it's the iMac's Networking. Airport would not connect either. And when I tried connecting, it would freeze up & Restart. It also does not shut down. No matter how I shut it down, it will Restart after 10 or so seconds. So I did a clean install of both Mavericks & Yosemite (at different times) and still the same. No Networking, Freeze ups & Restarts.The Logic Board was already replaced once in 2010. So I go online and find a Railink Driver for my Lynksys WiFi Card And the iMac is running beautifully. I've tried my Macbook Pro, my Mac Mini, iPad & iPhone. All have excellent Internet Connectivity. My iMac works just fine as long as I don't Sleep it, Restart or try & Shut Down. It won't Shut Down. When I tried 3 different methods of Shutting down, it just Restarts. So I'm thinking it's my Logic Board, but the funny thing is everything else is working flawlessly. iTunes, iPhoto, App Store, Word, & the Internet using the Lynksys AE1000 USB WiFi Adapter with the Railink Driver. Any thoughts? Something I maybe have not tried? Thanks in advance.
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m.paris
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PostPosted: Wed Feb 04, 2015 1:45 pm    Post subject: Reply with quote

I don't post very often but this one caught my eye. It is a bit of a shot in the dark; however, could it be that something is triggering the "Restart automatically after a power failure" System Preference? The symptoms sound similar although the actual cause is obscure. It may be that the power circuit is shorting out under shutdown conditions and is mimicking a power outage. Just a thought. It will be interesting to find out if you get this one solved.
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Dino1956
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PostPosted: Wed Feb 04, 2015 2:10 pm    Post subject: Reply with quote

Thanks for replying. I called Apple & they think it is definitely a Hardware issue.
You guessed it! Logic Board. But here's the thing. The iMac runs perfectly & does all the things it use to do, just as fast & just as reliable.So I Just sleep the screen at night. It's been running that way flawlessly for 2 weeks now. Funny thing, when I first had the issue, I was connected to my Modem through Ethernet. That is why I thought it was an AT&T issue or my 6 month old Modem. It screwed up my entire Network. When I disconnected it, my Network ran & is running perfectly. That's when I tried Airport and that would not find my Network, or sometimes when it did, it would stay connected for 25 seconds & then lose the connection. I tried deleting the Airport & Ethernet in Sys Pref & even deleting the Airport Preference file. I've tried everything. Nothing worked. So I hooked up a Lynksys AE100 USB Adapter & found a compatible Railink Driver & I have been online ever since. If it's the Logic Board, it's sure taking it's time to completely die. And if you used the iMac, you'd see how smooth it runs.
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iMac 27" 3.06 8GB ATI 4670 1TB HD
Mac Mini 1.83 Intel Core 2 Duo 4GB 80 GB
Macbook Pro 2.4 GHz i5 8 GB Ram 500 GB HD
Power Mac G5 1.8 GHz
Apple TV 3rd Gen
Time Capsule 1st Gen 2TB

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