....flickers? as in: the kind of weird screenshow you get when the gfx card is set to a resolution your monitor can't/isn't designed to handle?
if so, the problem may be that the computer it works on is set to a res the monitor can handle, but the other one isn't.
You can either try using another monitor and setting the resolution to one it should handle, like 640 x 480/800 x 600
use the monitor that doesn't work, boot into windows, and:
1: right-click any space that looks empty on your desktop, move the mouse cursor away from the opened window, hit the up arrow once and hit enter. this should take you to the display properties.
2: hit Tab 4 times, then hit right a bunch of times. this will take you to the Setttings tab.
3: hit Tab 3 times, and hit the left arrow key a bunch of times and hit enter. this sets your resolution to the lowest possible setting.
if you get a coherent screen, you should know what to do
i had to personally figure this out, because i had no spare monitor when it happened to me >_<
i hope this helps...