Connecting a macbook to a tv:  correct cables, still no picture or sound

I have the correct cables connected securely and I have no picture or sound displaying on the tv.  The mac screen "blinks" once when I unplug the adapter, so it is aware that it is connected to something.
Current setup:  2010 13" Macbook--> Mini DisplayPort to VGA adapter --> VGA Display cable --> Toshiba TV. 
Also:  Macbook--> Stereo Mini to RCA Y Cable --> TV.
If I hit system pref--> displays --> detect displays, nothing happens.  The tv is showing its default "I have no dvd in me so I will do nothing" screen.  I have tried changing the channel and input on the tv, restarting my computer, turning the TV on/off, unpluging and repluging cables, all to no avail.  The tv plays dvds just fine and is otherwise in working order as far as I know.  What's wrong here?

Input button already tried.  It doesn't do anything.
New thing:  a display icon has now appeared on the top of the screen.  I selected "turn on mirroring" which my television has blatantly ignored.  No progress.
Also:  guy at Best Buy seemed pretty sure that the RCA cable mentioned previously would do the job for sound, not that that is working either.

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