Hi,
I add to additions to Bernard's response -
1. If cells have borders set you may not be able to see the gridline.
2. Gridlines may not display when you are in a Table because of the default
formats.
3. Gridlines may not display when you are in a Pivot Table because of the
default formats.
4. Gridlines may not be visible if their color matches those of the cells.
If this helps, please click the Yes button
Cheers,
Shane Devenshire