Can not visually see the shading on the EXCEL file?

[lloyd]

when viewing the EXcel file, i can not see any shading. When viewing the file
with Page Preview I can see the entered shading.

 

[Debra Dalgleish]

If the high contrast setting is turned on you won't see the fill colour.
There's information in the following MSKB article:

OFF: Changes to Fill Colour and Fill Pattern Are Not Displayed
http://support.microsoft.com/?id=320531