Hi all,
yesterday, my HP11C (made in USA 1985) surprised me with a feature not seen so far: it didn't shut down! The day before it was working like always, but now it didn't accept any input from the keyboard anymore, displaying 1.7E-3 all the time. Removed and replaced batteries after some minutes: 1.7E-3 returned. Removed batteries again, shorted the terminals for some time, reinstalled batteries: all elements of the LCD show up, except the holy star! Stays this way for 12 hours now.
Any ideas??