I changed the settings on my desktop, and since then, Excel colors no longer
work. Can someone tell me where to go to restore excel colors?

I want to fill colors in a cell/cells, but the colors do not appear up on
the excel worksheet. However, the print preview shows that the excel has
recognized the color.

Also, when I try to change font colors, say black to read, yellow, etc., the
changed color does not show up in merged cells.

I would appreciate your generous help.