2008 iMac has: USB, FireWire, and Ethernet. 2014 iMac has: USB, Thunderbolt, and Ethernet. My 2008 iMac video card kicked the bucket, so I got a FireWire 800 Cable with 6-Pin Adapter, and an Apple Thunderbolt to FireWire Adapter, and connected them. I put the old iMac in target mode, but it doesn't show up in my new iMac. Disk Utility also doesn't register it. Is it even possible to use a thunderbolt/firewire adapter to put the display-less iMac 2008 into target disk mode, or is there any way to use Ethernet or USB to connect them?