Connecting Ethernet cable causes shutdown

Our 17" iMac suddenly shutdown and refused to start up - makes the start sound but shuts down after a few seconds.
Managed to get it going by removing all cables and resetting SMU. Then connected to network thru Airport.
The moment I reinsert the Ethernet cable the Mac shuts down. Thought it might be a faulty cable, but does the same with another cable which works fine on another Mac. Problem only happens when the cable is connected to the router, indicating it is not a short in the Ethernet port.
I suspect the Ethernet card in the iMac. Any other suggestions?
Any tests I can run to identify the issue?

An iMac has a SMC and the steps for resetting the SMC are different from another Mac resetting the SMU. And apple has revised the process since the iMac Core Duos were introduced.
Are these the steps that you used?
Reset the SMC
• Shut down the computer.
• Detach the computer's power cord.
• Press and hold the power button for 5 seconds.
• Release the power button.
• Reattach the computers power cable.
• Turn on the computer.
Run the Hardware Test on the original Install DVDs that shipped with your iMac.
Dah•veed

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Back up is very slow on 2 tb time capsule. After 2 days only 60 gb of 320 gb completed. Have connected ethernet cable. Any suggestions?

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Yes, that's terribly slow. You should get somewhere in the neighborhood of 20-24 GB/hour via Ethernet, assuming there isn't a lot of conflicting network traffic or your Mac's CPU is under very heavy load.
Are you sure you're actually using the Ethernet connection, instead of WIFI? To check, turn Airport off. If the backup fails, it's on WIFI. In that case, you need to set Ethernet as the "preferred" network, via System Preferences > Network. Click the "gear" icon at the bottom of the sidebar and select Set Service order. Then drag Ethernet above Airport. When both Airport and Ethernet are on, that will make OSX select Ethernet over Airport.
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Well, I first suspected that it was a ground problem and started unpluging the power from anything else I had plugged into the same power strip as the AE and clearing other cables out of the way. But then I unplugged the ethernet from the modem to get to another power cable and the radio station disappeared. It doesn't matter where it's unplugged from, just as long as the modem is not connected to the router. This tells me it's not RF interference on the audio cable, cause it sounds fine once the ethernet is out. I wouldn't think Apple would have the audio out and ethernet in connected or unshielded enough to cause this kind of problem, but maybe not. I will try the ground loop isolator cause it can't hurt, but I really think it's something inside the AE or modem. And unfortunately optical is not an option.
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I just bought a Time Capsule couple of weeks ago.
I have a mac with time machine enabled on Wi-fi. I also have a vista that I can't get the wireless card to work properly... It keeps disconnecting and connecting from the internet.
So I decided to plug an Ethernet cable between the vista and time capsule. Everything was working great, except that Time machine cannot connect to time capsule as long as that cable is there...
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Normally you'd connect it to your router via ethernet or wifi.
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You can even connect direct to a computer but would need to configure internet sharing for AppleTV to see the internet.
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Check out this link to the apple on-line store. It lists ethernet adapter/dongles, one for Thunderbolt/ethernet and another for USB/ethernet.
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Lately (the past month or two), I am tending to lose my internet connection. (I never would before.) I connect via Ethernet to my cable modem. My ISP tells me that if I am getting 4 steady lights on my modem (with the 5th flickering), it isn't the modem. (I was thinking of replacing it.)
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The colors refer to what Network Diagnostics shows. Network Diagnostics is an Apple app that pops up when Safari has trouble connecting. I don't use Safari but loved having Network Diagnostics pop up so I figured out a way to use it independently of Safari. I dragged it out of wherever it was buried, put it on my desktop where it became an app and I use it at will to see why I am not connecting.
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Most printers can print their status page.. on the status page is the current IP. I personally don't buy network printers that don't have a small LCD with enough menu to set things like IP address. And reveal the current IP.
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Hi everyone,
It's been some time I have this problem now.
The first time I backed up my mac within Time Capsule with time machine, I chose to use the ethernet cable because the gigabit connection is much faster than the wifi for the first back up, but now, any time I want to update this back up, I need to connect the cable, cause "Time Machine can not connect to the Drive I picked" over wifi.
This is so annoying. Does anyone have a similar issue ?
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Typical Yosemite.
I suggest a full reconfigure of the TC.
Follow this list..
No files are deleted on the TC doing this although you might have to repoint your laptop to the backup.
Note.. even if TM does connect it will say it is going to do a new backup.. it is only when it starts that it discovers the backup exists and increments it.
Start from a factory reset. No files are lost on the hard disk doing this.
Factory reset universal
Power off the TC.. ie pull the power cord or power off at the wall.. wait 10sec.. hold in the reset button.. be gentle.. power on again still holding in reset.. and keep holding it in for another 10sec. You may need some help as it is hard to both hold in reset and apply power. It will show success by rapidly blinking the front led. Release the reset.. and wait a couple of min for the TC to reset and come back with factory settings. If the front LED doesn’t blink rapidly you missed it and simply try again. The reset is fairly fragile in these.. press it so you feel it just click and no more.. I have seen people bend the lever or even break it. I use a toothpick as tool.
N.B. None of your files on the hard disk of the TC are deleted.. this simply clears out the router settings of the TC.
Setup the TC again.
Then redo the setup from the computer with Yosemite.
1. Use very short names.. NOT APPLE RECOMMENDED names. No spaces and pure alphanumerics.
eg TCgen5 for basestation and and TCwifi wireless name.
If the issue is wireless use TC24ghz and TC5ghz with fixed channels as this also seems to help stop the nonsense. But this can be tried in the second round. ie plan on a first and second round of changes to fix this.. hopefully.. I will point out other steps that can be round2.
2. Use all passwords that also comply with 1. but can be a bit longer. ie 8-20 characters mixed case and numbers.. no non-alphanumerics.
3. If the TC is main router you can skip this point. This is only an issue when the TC is bridged.
Ensure the TC always takes the same IP address.. you will need to do this on the main router using dhcp reservation.. or a bit more complex setup using static IP in the TC. But this is important.. having IP drift all over the place when Yosemite cannot remember its own name for 5 min after a reboot makes for poor networking.
4. Check your share name on the computer is not changing.. make sure it also complies with the above.. short no spaces and pure alphanumeric.. but this change will mess up your TM backup.. so be prepared to do a new full backup. Sorry.. keep this one for second round if you want to avoid a new backup.
5. Mount the TC disk in the computer manually.
In Finder, Go, Connect to server from the top menu,
Type in SMB://192.168.0.254 (or whatever the TC ip is which you have now made static. As a router by default it is 10.0.1.1 and I encourage people to stick with that unless you know what you are doing).
You can use name.. SMB://TCgen5.local where you replace TCgen5 with your TC name.. local is the default domain of the TC and doesn't change.
However names are not so easy as IP address.. nor as reliable. At least not in Yosemite they aren't. The domain can also be an issue if you are not plugged or wireless directly to the TC.
6. Make sure IPv6 is set to link-local only in the computer. For example wireless open the network preferences, wireless and advanced / TCP/IP.. and fix the IPv6. to link-local only. Do the same for ethernet if you use it.
There is a lot more jiggery pokery you can try but the above is a good start.. if you find it still unreliable.. don't be surprised.
You might need to do some more work on the computer itself. eg Reset the PRAM.. has helped some people. Clean install of the OS is also helpful if you upgrade installed.
Tell us how you go.
Someone posted a solution.. See this thread.
Macbook can't find Time Capsule anymore
Start from the bottom and work up.. I have a list of good network practice changes but I have avoided Yosemites bug heaven.
Yosemite has serious DNS bug in the networking application.. here is the lets say more arcane method of fixing it by doing a network transplant from mavericks.
http://arstechnica.com/apple/2015/01/why-dns-in-os-x-10-10-is-broken-and-what-yo u-can-do-to-fix-it/

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Given wireless range of Time Capsule is 150', will this work? Put DSL modem on phone line in garage, connect ethernet to small office bldg (125') and connect separate ethernet to main house (200'). Time capsule on each end (or Airport Express)? Thx

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Can connect via ethernet cable, have good Airport signal but no connection

Hey folks,
Pesky problem. I'm trying to connect to my wireless airport extreme basestation and having problems. Everythings hooked up correctly and if I plug the ethernet cable from the modem directly to the powerbook it works fine. The odd thing is that my computer sees the base station, it has good signal, and it tells me I'm connected to the internet via airport.
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Cheers,
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Sean,
---- I was trying to get a link to another similar thread, where one of the experts (I'm not one of them) made some recommendations, but I can't seem to find it.
---- Is your Network Preferences selected for Airport as well as ethernet, and is Airport at the top of the list? Anyway, the fact that your direct connection PB to modem is working fine, may be the very thing causing your problem. The modem looks for the PB (MAC address?). So, you can do an hardware reset, or if not then unplug it for a good while (not tooggle the power on & off, but I think I saw someone even recommend overnight). Shutdown the AEBS & PB.
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Connecting Ethernet cable causes shutdown

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