Ports not working on TBD connected with iMac

I have a 27 inch Thunderbolt display connected with a 27 inch iMac. All the port (USB, Firewire) were working on the TBD. Then a software update of TBD came and since then none of the ports (USB, Firewire) are not working anymore on the TBD.
Before I could adjust brightness on the TBD, now I can't even do that.
Anyone facing the same problem

Hi Danny
Using what adapter(s) and cable(s).....?
Check the TVs owners manual or LGs support site, there maybe a way to reset the HDMI ports if they were tripped or overloaded by a bad cable or connection.
Dennis

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