Hello Guys,
I use a HP 11C for study since 2009 and Iam very happy with. It was bought in 1985 by my father on US holidays.
Unfortunately I have a problem with it this days: It shows a blinking "3" on the display. All buttons and functions are disabled. I already tried to fix the problem with new batteries. Didnt work!
Do you have a tipp for me to solve the problem? Is it an usual error?
Best Regards
Hannes