If you do File|Print Preview, do you see anything?

If yes, then maybe your worksheet window is just off the screen.
Window|arrange|Tiled and resize it the way you like.

Mim wrote:

When I open an existing workbook there are no worksheets showing. There is
only a gray screen.
If I open the Excel Application first, then open an existing workbook
through File Open, then I can see the pages.

--

Dave Peterson