Exactly how do you have the show going to the second monitor? If it is
through the VGA output on a laptop and the same image is supposed to be
shown on both screens, you may have to disable hardware acceleration in your
video card setup. This may also fix the problem with the video on second
screen if using the Presenter view with multiple monitors.
If this is a laptop and projector system with the same image on both
monitors, use the control FN key and whatever F key on your keyboard that
changes the order of the video output (it toggles from laptop LCD only, VGA
output only, and then LCD & VGA output.) Many laptop and internal video
cards are not "powerful" enough to drive both an internal and external video
device. (Hold down the Fn key and press the F key (different on different
laptops but will have a picture of a monitor/and other device or have the
initials LCD on the keycap) one time. Wait for at least 10 seconds for the
action to take place before pressing again for the next action.)
If the first two paragraphs don't help, please answer these questions.
If you can't see a wmv image on either screen, can you see the image when
using only one viewing source?
Can you play the wmv file in Windows Media Player on the primary monitor?