Hi,

My HP97 is having problems. It turns on with the correct display '0.00'. After this if I try to use the keyboard then say press the key '1' then the display changes to'-1000000000. 00' (the last two zeros are in the exponent position). This is same with any of the numeric keys except that the first digit is the key pressed. If I press say key '1' the display will be '-1000000000. 00', press ENTER, if I then press say key '2' the display will be '-2000000000. 00' and press '+' the answer is displayed correctly '3.00'. If I perform operations like X2 or SQRT X the result is computed correctly.

I tried using the HP97 diagnostic card. I read in both the sides of the card and the display changes to '0. 00'. On pressing key A to run the diagnostic program results first in the display showing '5. -07'(instead of the usual 57 on the display) followed by '-8. 00'.

Any clues to what could be the problem and any suggestions to solve the problem? Thanks,

Prabhu Bhooplapur