A black screen when sending Dvds~Media files to your Tv then try this i stumbled upon whilst messing with my drivers. (Copy of my post from Guru`s site where this had been a problem since the 4*.** Drivers were released) I just had the same problem with my gf4ti4200 set in advanced settings to clone ....desktop shows up ok on tv but when playing a video all went black...i could still hear sound....so i fixed it by going to the GF4Ti4200 TAB then going to OVERLAY CONTROLS and then changing FULL SCREEN DEVICE TO "SECONDARY DISPLAY" then just press apply. It works on BOTH my systems using the 41.09 driver from Nvidia.com. If it works please reply so we can pass the word about.