Question about Texas Instruments Office Equipment & Supplies
...a solid black square in the top left corner? if so, blow hard into the I/O port on the top of the calculator. That fixed the problem for me. shut it down and put it away for 5 days, then it will
Question about Texas Instruments Office Equipment & Supplies
...black square in the center I've tried pressing the 2nd key and then the down button but nothing seems to work and the back up battery is new and new AAA batteries in it to. Hello, Read this article ...
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