Projectors‎ > ‎

Powerpoint - presentation ratio

If you see your screen properly (using the complete screen), but when you go into presentation mode, there is some black on the sides (or on top and bottom), you need to "adapt" your Powerpoint to the right screen ratio.

In Powerpoint 2007 and 2010, this is done from:

Design tab -> Page setup

From there you select the right ratio for your Projector (4:3 default, you can select 16:9 or 16:10)