Fix the calculator, calmly.
Match what you see, check the likely cause, and recover without deleting work you still need.
Settings checker
Tap each check as you confirm it on your calculator.
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Syntax & domain errors
The calculator reports ERR:SYNTAX or ERR:DOMAIN.
Open guideDimension & stat errors
You see ERR:DIM MISMATCH, ERR:INVALID DIM, ERR:STAT or ERR:DATA TYPE.
Open guideSign change & bound errors
A zero, solver or calculus tool cannot locate the requested point in your interval.
Open guideGraph not appearing
GRAPH is blank, nearly straight, incomplete or shows an unexpected vertical line.
Open guideStat plots off
Old data points appear, graphing gives INVALID DIM, or a function graph behaves strangely.
Open guideWrong trig answer
A sine, cosine, tangent or inverse-trig result is nowhere near the expected value.
Open guideScatter/regression fixes
Data do not plot, or regression output omits r and r².
Open guideProbability result wrong
A distribution probability is negative, above 1, or inconsistent with the wording.
Open guideTable not right
The TABLE screen starts in the wrong place, skips values or shows blanks.
Open guideMissing solutions
A solver or graph reports only one solution but the question suggests more.
Open guideCalculator frozen
The calculator does not respond normally or a calculation takes unexpectedly long.
Open guideWrong graph mode
Y= looks unfamiliar or the calculator expects X1T, r, or sequence variables.
Open guide