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To adjust the screen contrast, press and release the 2ND key, then press and hold the up-arrow key to darken or the down-arrow key to lighten. If you go too far, press and release 2ND and press and hold the opposite arrow.
Sounds like your contrast is a little too dark. Press the 2nd key and then hold down. This should dim the contrast. If you dim it too much simply daeken it by pressing second and up.
If this helps please dont forget to vote. Thanks
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 that doesn't work, add a comment to this post and we'll go from there.
Have you tried 2nd then down arrow. This adjusts the brightness of the screen. You may need to repeat it a few times (you must release the 2nd key, you cannot just hold it down and type the down arrow many times).