Check the contrast. Someone might have been messing with you and turned it really high, so everything is white. Turn it on, and then push and hold 2nd, then the down button (possibly up... I don't have it with me at the moment, so I can't remember which one.) You should see something now. Tell me how it works out, and hope this helps!
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TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and hold the diamond key. Press and hold the + key for a few seconds and see whether the screen becomes legible. Does it?
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