How do I change the default border colour in a table in Powerpoint

[MarieB]

Somehow the default colour in a presentation template that has been created
is white, how do I change this to black so that all future tables appear in
black.

 

[Geetesh Bajaj]

You'll have to change the color scheme to change the color of the table -
more info at:

Color Schemes - http://snipurl.com/colorschemes
Creating a Color Scheme - http://snipurl.com/juliecolorschemes