TV screens go to snow when I play some karaoke songs on my laptop

[charliebeck]

I work at a place that still uses cd+g discs and a player. There is a modulater that feeds 3 tv's that the machine is hooked to. When I disconnect the RSQ and connect my 2007 HP pavilion entertainment notebook to the modulator some of the songs on my external hard drive will play and some go to snow when they start. The audio will still work. The same songs that go to snow on those screens will play fine on the tv that I use for shows.
Whazzzzzzzzzzz Up????? Thanx for any help.
Charlie Beck