My formulae are not working.

[Binoli]

Once I enter a simple formulae like add 2 cells; then when I cange the
contents of one of them the answer cell does not change. My excell does not
respond to sensitivity analysis. Any method to solve this proble. I have also
reinstalle dthe same, but no use.

 

[Kassie]

Tools | Options | Calculation, and make sure that Automatic is ticked