Hello, I have just bought new MBAir which is currently running on a wireless network. I connected this to iMac using the thunderbolt cable, though the connection is perfectly made with all guidelines, iMac is not showing any connected or paired devices in the shared devices column. I tried unplugging the thunderbolt cable many times and restarted the machine many times, but no progress. How should I make this happen, hope you understand my issue. thank you.