Personally I do not know why because I do not lnow what the calculator went through. However, if the calculator was working correctly but after you changed the batteries it does not seem to come alive when you press the ON button, then I may have an idea. Here it is.
After you change batteries, the screen may become too dim or too dark. For your case it may be too dimm.
To darken the screen, follow the procedure below.
1. Press the [2nd] key and release it.
2. Press the UpArrow and hold pressure on it (to darken screen) or DownArrow to lighten screen.
As you keep the UpArrow held down, you will see somes numbers at the top right corner of the screen. You mifgt first see a 2 or a 3, then the next number and it keep increasingAfter a while it becomes too dark to see anything.
To lighten the screen
1. Press the [2nd] key and release it.
2. Press the and hold the DownArrow
As you keep the DownArrow held down, you will see somes numbers at the
top right corner of the screen. You mifgt first see a 8 or 7 , then the
next number and it keeps decreasing.
Release the Arrow keys when the screen contrast is to your liking.
If you overshoot your intended screen contrast you can revert the process by reverting the procedure.
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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 release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible. Does it?
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