it was working the other day but now i can not graph any thing. the screen keeps telling me invalid dim? i know how to do everything but now it just will not work
All of my keys are frozen, i took out the batteries and everything but the keys will not work at...
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All of my keys are frozen, i took out the batteries and everything but the keys will not work at all. I don't have any downloads on it or anything, i just turned it on and no keys will work.