Q: Wifi works but Ethernet does not
I just switched ISP. I am using RCN's cable modem which is the same one that Xfinity uses. I am also using a Linkysys EA4500 router. I had no problems with the set-up yesterday before they changed it over this morning.
I have two iMacs (myself and my wife). If the cable modem is directly connect to either of the two iMacs, the internet works fine. However, when the Linksys router is part of the configuration, my wife's iMac can connect via Ethernet port but my iMac will not. My iMac can connect via WiFi. However, it will no connect if I use an Ethernet cable.
I have already reset the router to factory setting and reboot by iMac and clear the PRAM, swapped out Ethernet cables. What's going on here?
iMac, OS X Mountain Lion (10.8.5), null
Posted on Jul 23, 2016 8:05 AM
Try the following:
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
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Ethernet troubleshooting
Trash the following plist files by going to Macintosh HD>Library>Preferences>SystemConfiguration
com.apple.airport.preferences
preferences
NetworkInterfaces
Repair permissions and restart your computer. Empty the trash.
Afterwards try John Galt's suggestion again if you are still experiencing ethernet problems.
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If you have AppleCare, give them a call & let them deal w/it. You are entitled to onsite service since you have a desktop.
Out of warranty, lug your iMac to your local Apple Store or an APSP.
Posted on Jul 23, 2016 4:33 PM

