I am trying to connect my computer to the TV, but I'm receving no signal. I've followed the very minimal instructions in the manual, but still no signal... I simply plugged the VGA cable from the computer to the TV and the audio cable as instructed - no signal. I changed the source on my TV to "VGA" as instructed - NO SIGNAL. There are no troubleshooting guidelines available, so I tried to do everything I know to troubleshoot myself. Any suggestions?