In attempting to fix another issue, I consulted this forum and entered the following in teminal: sudo launchctl -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist That's when my internet stopped working. Modem is fine. All other boxes in the house access internet just fine via hard wire or WiFi. All settings in preferences/network are fine with green lights for ethernet and WiFi connection. I obviously screwed the pooch by messing with sudo. Anyone got an idea how to fix? Will recovery via Time Machine do the trick or will I have to re-install the OS? Thanks in advance.