HELP WITH VISTA BEFORE I THROW DELL COMPUTER OUT THE WINDOW

[zzzzz]

Have been using Karafun on a Dell Win Xp system with no problem. Just bought a Dell with Vista and I have a strange problem. I have compared settings and cannot resolve. Karafun seems to work fine but if I stop and do nothing with the computer for a few minutes and come back to play a song the screen is black and the song does not run. It just sits there. Sometimes after several minutes it starts. I have compred all of the display settings with both the XP system and the Vista system. Both computers eaisly meet the software requirments. I run the karafun on the laptop screen and the video out thru an 'S" video to a small TV flatscreen. Everything is set the same on both computers. zThe other strange thing is that when I hit the play button of the stop button or the pause button on Karafun control panel the whole screen blinks black for a moment and than the program runs if the black screen does not appear. Is the a glitch with Vista. Any HELP ????????? PLEASE !!!!!!!!!
Monk