My TI-89 will not turn on I have changed the batteries and still nothing. I haven't done anything reckless with it either why is it doing this? Does it have to do with the back-up battery? Do I have to change it?
Office Equipment & Supplies - Texas Instruments - TI-89 Calculator
Answers & Comments
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 append a comment to this post and we'll go on from there.