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.
If this doesn't do it, please reply to this post and we can go from there.
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Remove all four AAA batteries. Press and hold the ON key for fifteen seconds. Replace the batteries. Does the calculator turn on and respond properly?
If this fails, repeat the process using the DEL key instead of the ON key.
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