yes, excellent point! You can't have two things plugged into one. Two examples:
1. Having a single TV channel that accepts inputs of a red and white audio with either a yellow video OR an S-video. It can't accept both at the same time, so it gets confused. It will work with either the yellow OR the S-video in, but not both.
2. Having a universal game cord that has connections for more than one game system on it. For example, you get a universal cord that can have a Wii, a PS3, OR a xbox 360 connect to the TV. But again, it only works if just one system is plugged into it at a time--it's still multiple sources going into one TV channel.
The way to solve either of these is to redo the connections to the TV (get some component cables--the red,green,blue video ones, or some HDMI cables, etc.), OR get a selector box that would allow you to connect 2-4 (or more) devices into it, have one set of outs to the TV/sound system, then select on that box which one you'll be using and let the box do the rest.
(aka Mommy_T) Central US
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