Does not turn on screen just flash cisco 7970 ip green buttons

Unanswered Question
Jul 22nd, 2010
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Hello,

I have an IP phone 7970, which you turn on turn on the three buttons Headset, Mute and Speaker, and starts flashing the keys to the right of the screen, the screen does not light, I have tested with various types of food, but not turn on the screen ... I can do??

Thanks

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