Thunderbolt to HDMI doesnt work

I'm having trouble setting up dual monitor for my video editing work, I'm using LG (24MP76) as 2nd monitor hooking up to iMac (12,2) i5
Using thunderbolt to HDMI cable. It doesn't work at all, iMac doesnt pick up and LG kept searching then shut down to energy mode.
Any idea how to solve this problem and quick please
Thanks

Hello bigant06,
Start your troubleshooting with the article below. Go through and test with a different cable if you have one as well as resetting the SMC and PRAM. If you are still having issues, let me know and I may be able to help you further. 
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/en-us/HT201177
Regards,
-Norm G. 

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