How many HP-25Cs have we lost?

[waspentalive]

I have an HP25 that seems to have a problem, I had replaced the Nicad batteries and it was working, but then one day it displayed only a "1". Now it won't power on at all. I have an HP-specific charger that fits the connector at the top of the calculator, and I tried charging it. No help. I have also tried taking out the nicads and putting normal AA cells - same behavior.

Is this the "Lost" failure mode you have been talking about?

Is there a fix? Can I easily repair my calculator? I do not feel technically capable of soldering inside something like my HP25 so if the fix is hardware, I will have to seek help.