09-15-2006, 01:16 AM
I just changed the batteries in my 11c and now the display reads: 0. on the far left of the screen and 00 on the far right of the screen. It will not do basic math. Please help. I have had this calculator since about 1986, and I have never done anything more complicated than basic math much to my brother's dismay. However, I would like to continue to use it to balance my checkbook.