Unfortunately that didn't help. I now have "Thunderbolt Software" version 16.3.61.275 installed and my keyboard and mouse still works fine through the thunderbolt port (as before), but no screen detection. Also, when I run the Thunderbolt Software program, I see no devices listed in its "Attached Thunderbolt Devices" (Also reads "Attached Devices Chains") window. So for now I'm still swopping screen cables each time. Any new suggestions? In the Thunderbolt Software details screen, these are the version numbers: Software Package Version: 16.3.61.275 Application Version: 16.3.61.14 Service Version: 16.3.61.3 Controller Driver Version: Unknown Networking Driver Version: Unknown
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