Macbook's ability to use tv disappear overnight

I have been using a HDMI cabel from my macbook pro to my tv. It has been working for the last month, and suddenly it doesn't work. My computer turns blue but the tv screen does not. Any one know what is wrong? I have checked all the cables to tv etc.

The Mac Pro uses a single, heavily-parameterized Driver, and customizes it with the capabilities reported by the attached devices. In order to show a picture automatically, each display device must properly identify itself to Mac OS X.
About this Mac > ( More info ) > Graphics & Displays...
... should show an entry for each display device you want to have a picture on it.
If not shown on that list, there is no simple way to get a picture onto a display.
Sometimes changes of TV settings can make the TV think it is no longer talking to a computer, and no longer needs to self-identify.

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Macbook's ability to use tv disappear overnight

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