Hello everybody! That's the first time I write in this forum.
I have a problem with my HP 11c: From time to time it hangs up itself after pressing a key. That seems to appear more often after pressing a key in the upper row but I'm not sure about that.
Randomly the calculator then switches off (?, at least the display is off) or it's "freezing", that means the calc doesn't react at keystrokes but the display is showing nevertheless the last entry.
To awake the calc sometimes it helps just to press the "on"-key or "on" + "y^x" (several times in some cases), but in most cases I have to short-circuit the battery contacts. Then it restarts with the normal "Pr Error" display.
Can anybody give me some hints which causes the fault may have and how I maybe fix that? Thank you!