Question about Texas Instruments TI-89 Calculator
The calculator keeps giving me the message :"Internal Error" when I tried to enter any calculations or command at all after I put in new batteries (both the internal and the AAA batteries.)
Try holding [left][right][2nd][on], that reinitializes the calculator and clears the ram. If that doesn't work you could try reinstalling the OS (refer to manual for details). If it still doesn't work, you will probably have to call TI.
Posted on Jan 18, 2007
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Posted on Jan 02, 2017
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