HP 12C Function key not working propoerly. I am trying simple cash flow problems with my instructor in my finance course. He is watching me to make sure i am entering it correctly. My 12C gives a different answer than his 12C. He says it must be the "F" key because he tested a few other entries and they were not correct. I've tried to do a reset on my 12C, but the problem will not work. I am confident in my entry. Any suggestions?

SOURCE: Changed batteries, zeros are in display but no key response

Perhaps a the connections are dirty (battery connections) or you may have the wrong battery type/model

SOURCE: HP 12c cALCULATOR

It is not calculating because your decimal point and the digit separator (that's the comma which automatically displays for every group of 3 digits) got messed up. To clear, turn the calculator OFF, then press and hold down the dot (that is the decimal point symbol) key while you press the ON key..
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SOURCE: The keys stick on my HP 12C calculator so that

Try glass cleaner with a paper towel. If that doesn't work you'll have to take it apart and remove the button pad.

SOURCE: HP 12C Platinum: Whenever I try to solve for

Having gone over a month with no response, I assume this is no longer a problem.

SOURCE: I am currently studying for the CFA Level I exam,

Personally, I'd go with the regular, or the Plus, staying away from the Platinum. There's nothing on the calculator or package to distinguish the Plus from the regular, but the Plus uses two coin batteries while the regular uses three button batteries. The Plus is just like the regular, except a LOT faster.

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