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Try taking the batteries out and put them in again. Also try to clean the contacts with a pencil erasser. Try putting in new batteries.
If you have the turn knob inside the door check to see if the plastic isn't cracked (broken) if it is that would stop your batteries from working.
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 release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.
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