i just got a sr mbp and the s-video output cable so i can watch movies on my tv, but i would like to watch it without having my mbp open. when i close the lid though, the computer goes to sleep and the tv screen goes blank. i was told if i plug in mouse that this would keep the mbp from sleeping, but no luck. im using a ms mouse with the drivers installed. does that make a diference? does anyone know if am i doing something wrong?