HDMI ports on LG 60FD TV not working after to using with iMac

I have attempted to connect my new iMac to the HDMI ports on my TV. The TV out feature worked fine for approx 1 day, but then for some reason stopped working. No HDMI devices will then work from that port.
When plugging in the iMac or any other device to these ports now, the TV recognises that something is plugged in, but shows "no signal" on the screen.
My TV has 3 HDMI ports, and by plugging them into my iMac, it has rendered 2 of them unusable. I am not going to attempt using the 3rd port for fear of that one being broken too. (The 3rd port currently has my PS3 connected and working fine. My PS3 used to work in all ports)
I sincerely hope I am missing something simple and there is some kind of easy fix.
Any help is greatly appreciated.
Danny M

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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