Has new battery and wont turn on - HP 12c Calculator

Hello, You can try to perform the self-test. Procedure is as follows. To perform the self test on units with two batteries:

1. Turn the calculator off.
2. Press and hold the and keys; keep both keys held down for the next step.
3. key shas new battery and wont turn on - c01788481.jpgc="/uploads/images/c01788483.jpg" alt="c01788483.jpg" class="h_mi" /> and keys are held down simultaneously.has new battery and wont turn on - c01788482.jpgass="h_mi"> Release the key.
4. Release the key, followed by the key. The main test screen displays the follhas new battery and wont turn on - c01788485.jpg.C 3.H'.
   • Press to perform the LCD test (all LCD segments will be turned on). Press any key to exit.
   • to perform the checksum test and see the copyright messages. Press any key to go from one screen to the next until the main test screen, '1.L 2.C 3.H', is displayed again.
   • Press to perform the keyboard test. Press EVERY key on the keyboard until all the keys have been pressed at least once. The screen will progressively turn off with each key press. Once all the keys have been pressed and the screen is clear, press any key to return to the test screen.

1. Turn the calculator off.
2. Press and hold the key, and simultaneously press and hold the key.
3. Release then .
4. After a few moments, all elements of the screen should be displayed. Press any key to exit.