Calculator is ok till I changed its batteries
Now my calculator cannot startup! Remember, always before changing batteries, back up any programs or solver equations!
One common problem is after installing new batteries, the calculator appears dead and will not power up. This can be sometimes be fixed by completely resetting the calculator and completely clearing memory.
Remove the battery cover and shake the batteries out. Now, using a small coin (or paper clip), slip the sides of the coin between the battery spring clips so that you touch both sides of the battery clips at the same time with the coin. This discharges the internal storage and will clear memory. Now, reinstall the batteries, observing the proper polarity picture shown on the case, slip on the battery cover and turn it on. You should see a ‘Memory Clear’, ‘Pr Error’ or similar message and you’re back to calculating.