I'm very frustrated at the moment so forgive me. The problem I'm having is my 2009 i7 iMac refuses to give me 1000baseT (Gigabit) ethernet. It auto-negotiates to Fast Ethernet, despite everything in my network chain offering Gigabit speeds. When I attempt to force the connection to 1000baseT, it returns an error saying "Cable unplugged." I have no trouble seeing 150MB/s speeds on Wi-Fi. If I unplug the Ethernet cable and plug it into my work laptop, I'm seeing 166MB/s speeds, meaning it's the iMac, not the connection, that troubles me. Can anyone assist me? Numerous previous questions to the Support Communities for this exact same issue always lead to the same responses (i.e., "Are you sure your router/modem/cabling can handle it?"). Anyone have any ideas on this?