I was watching a DVD movie from my Samsung BD-P2500 on my Samsung LCD LN46A6501F TV. I turned off the DVD player and switch the TV source from HDMI to S-Video. I notice the S-Video was missing Audio even though the S-Video source works. I tried to reset the Audio by turning the TV off and unplugging the power plug. I than removed all the connections except S-Video and reset the Audio under the setting menu. The troubleshooting section in the user manual does not have any information to correct the problem. I do have audio from all other sources and I downloaded the latest firmware but the TV already had the latest version (Module: T-Ambausc-2007.0). Any suggestions? Is there a way to reset my LCD-TV to the factory default setting? Does a TV have a BIOS?