Recover from a frozen-looking calculator

01

Press these keys

ON2ndON

02

Walkthrough

1
Wait and interrupt
A graph or numeric calculation may be busy. Press ON once to stop a running operation.
2
Power cycle
If responsive, press 2nd → ON (OFF), then ON.
3
Last resort
Use the documented reset opening on the back only if the calculator is unresponsive; this may clear RAM. Do not improvise with All Memory.

03

Worked example

A difficult graph keeps drawing and keys seem ignored.

NORMAL FLOAT AUTO REAL MPpress ONBREAK or home screen

AnswerInterrupt the calculation, then simplify the graph/window.