Why does my Vizio hdtv say no signal when I connect my minidisplay port to hdmi cord between my macbook pro and tv?

My Vizio hdtv says "No Signal" when I use my mini displayport to hdmi cord. It worked flawlessly for a month but randomly decided to no longer work.
I am using a macbook pro from early 2011 running os x Lion 10.7.5 and a thunderbolt to hdmi cord. The cord has worked without a hitch the numerous times I've used it until recently. Now plugging it in will cause the macbook to flash blue quicker than normal and immediately go back to the normal screen. I know the macbook recognizes the TV because changing the input on the TV to the hdmi connected to the computer will cause the macbook to flash blue again, with the same result. The TV remains unresponsive. I have tried all combinations of turning on and off the TV and macbook with the cord plugged in and unpugged from either and both systems and in both hdmi inputs on the TV. I've changed the display resolution to every possible option with no result. The TV is not recognized as a display on either the Display section of System Preferences or the Sound section.
It confounds me that the cord should work flawlessly until now, a month after buying it, for no apparent reason. I've been gentle with the cord, so the problem being a result of damage is unlikely. I had not updated my computer in any way between the successful and unsuccessful uses of the cord, but I have since updated my computer and the problem remains.
I have searched for this problem on the Internet and have seen others with similar problems, but I have not found a solution that resolves my problem. I hope to avoid having to make any additional purchases.
And a thousand and one thanks to any and all who help.

Do you have gfxCardStatus installed?  Is your monitor set to "Integrated" or "Discrete".  You want it set to Discrete to drive the external HDMI display.
Try resetting the PRAM and SMC
<About NVRAM and PRAM>
<Intel-based Macs: Resetting the System Management Controller (SMC)>
Are you sure you have a good miniDisplayPort to HDMI cable?
Do you have another HDMI display you can test against (your neighbor's HDMI capable TV).
Do you have friend that can test the cable using their Mac and maybe their TV or a monitor that has HDMI input.

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