Question about Texas Instruments TI-89 Calculator
If nothing is visible on the screen, increase the contrast by pressing and releasing the 2ND key then pressing and holding the up-arrow key.
If the screen is visible but you get no response to the keys, press and hold the 2ND, left-arrow, and right-arrow keys, then press and release the ON key.
If this doesn't do it, please add a comment to this post and we'll go on from there.
Posted on Sep 12, 2010
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Posted on Jan 02, 2017
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