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Troubleshooting 7911 No Display- phone works, no display

I have 18 > 7911 phones that are able to make and receive calls, however their displays are not working.

The ITN servicing these phones was changed out, and this is when they stopped working.  there were 7960s working at the same location, the displays went out on those as well, however, when the customer unplugged, and plugged them back in, they came up. They uplugged/plugged the 7911s but they did not come back up.

Note: it is only a display problem.

Has anyone had any experience with something like this? Would you, could you give me some info on how to get the displays working again?

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