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Nothing on LCD of cisco IP Phone 7940

Hi All,

I need help about cisco IP Phone 7940 Problem

when I connect it to the switch ,it just power up and headset led be on for a few seconds then Mute led on also for a few seconds after that repeat (headset  on,Mute on,....) and so on for ever

I tried to reset to factory put no response ,nothing on screen

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Nothing on LCD of cisco IP Phone 7940

There are many many identical threads on the subkject, please search.

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