Arrow Keys not working

Suddenly, inexplicably, my keyboard arrow keys stopped working recently. Now, rather than navigate to/from highlighted cells, the arrow keys move the entire screen left right up & down. In addition, SHIFT+PG UP and SHIFT+PG DN are not working. And HOME now navigates to the top left of the visible screen, as opposed to Column A of the Row that I am working in.

Did I inadvertently switch something on or off? Does anyone know how to return my arrow keys to their normal functioning?

DPKologie

try to hit the scroll lock button. It is in the upper right hand corner of the key board.

You ... are a genius! Yup, that's what it was - the scroll lock. Thanks so much. This makes my work much easier.

The only reason I knew that is because it happened to me too recently.