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[101netball]

I have run into a problem with my CAS calculator, the screen displays a blank white screen and it doesn't seem to be functioning correctly. I have tried to replace the batteries and I've tried to restart the calculator with the restart button on the back, however, none of these have worked. Sometimes, the screen will just go black and I won't even be able to turn it on to the white screen using the power button. I have to open the back panel and adjust the batteries and then the white screen turns back on, but shortly after, it'll go black again.

What should I do?