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Having gone over half a year without a response to my query, I assume a new set of batteries solved the problem. The Anniversary Edition 12C uses a much faster processor than the original 12C. The new processor also uses more current, and thus you won't get battery life as long.
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 fix it, please reply to this post and we'll go on from there.
i tried furiously blowing in to the back of mine with all 4 AAA batteries and the back up battery removed then i left the batteries out for 2 days it works again with really minimum use... you have to repeat the blowing and leaving out nonsense every week sometimes you regain use by rubbing the AAA batteries back and forth while they're in place
You should press the 2nd and then hold the down arrow to cahnge the contrast. If that doesn't work then you should try resetting the calculator by taking both the back up and main batteries for 45 seconds.