Connecting Macbook to TV help

I need tech support! Connecting my Macbook Pro to an LG TV via mini display port to HDMI cable. I've used this cable with no problems before but now when I connect it, my computer screen just flickers for a second and the TV doesn't get the signal. I've tried doing an SMC reset and tried adjusting the resolution on my computer but it still won't connect. Any ideas? Could it be just a bad cable?

Yes.  Also I recommend reading this tip on external displays:
https://discussions.apple.com/docs/DOC-2821

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