HELP! I can't use the factor feature under the programs menu for my TI-83 Plus calculator. How do I fix this?!

Question

I entered in a number to be factored, and then accidentally pressed another button. I do not know what it was, but when I try to factor another number, it takes me to the error window. It says

Err: Nonreal ans
1: Quit
2: Goto

When I press "Goto", it takes me to another screen that shows:

Program:Factor
:Goto
:Disp M, F/M
:
:Pause
:Lbl X
:M+A ->M

Any idea how to fix the problem. I can't factor anymore! I think in between the space under Disp M, F/M there should be something under it. I have a major math test tomorrow and I need my calculator to work. Please help!

Answer 1

Question: Is this a program of yours or one that
came with the calculator? It looks like a
line of the program got erased when you
hit the wrong button.
The error you're getting means you are
trying to take the square root of a
negative number.
If this program
came with the calculator, try resetting
the memory. I had a student in class
who kept getting weird errors like this
and resetting the memory fixed his problem.
If you or someone else put this program into
the calculator, I would need to see the program
to find the error.