Why do I get a black screen when I turn on my TI-Nspire CAS?

Hi, when I turn on my TI-nspire CAS calculator it shows a full black screen. I have replaced the batteries, pushed the re-set button on the back, updated the software to and still nothing happenes. The calculator works fine as when I do a "screen capture" from when it's connected to the computer, I can see what is on the calulator screen.

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