How do I set MacBook to an external display when the plug and play doesn't recognize it?  I am trying to set my Samsung 530 LCD as a monitor but HDMI and VGA cords (and the adaptor for them) doesn't seem to work.

I have tried everything I can find on line but they all claim that the plug and play works, and they don't for me.  I tried the mini dvi to HDMI and a HDMI cord and that was not recognized no matter which unit I rebooted first.  I found someone who said that my Macbook might be too old for the HDMI technology so I returned the cords and went to the VGA cord and adaptor.
I tried this first with the HDMI setup:
http://support-us.samsung.com/cyber/popup/iframe/pop_troubleshooting_fr.jsp?idx= 167919&modelname=LN40C650L1F&modelcode=&session_id=NDhJrD0DQT0Z8KRsm62yhxJxqnyPy SKhlhpB8vQ6h9Q7R2BZJGzj!-1089109758!1761676444!7501!-1!434477884!1761676348!7501 !-1!1292098185857
Then I tried this with the VGA setup:
http://support-us.samsung.com/cyber/popup/iframe/pop_troubleshooting_fr.jsp?idx= 167901&modelname=LN40C650L1F&modelcode=&session_id=NDhJrD0DQT0Z8KRsm62yhxJxqnyPy SKhlhpB8vQ6h9Q7R2BZJGzj!-1089109758!1761676444!7501!-1!434477884!1761676348!7501 !-1!1292098185857
I contacted Samsung support and they said I needed to set the display settings to external display on the mac.  I went to the display settings and moved the icon to my status bar.  When I click on search for displays or whatever it says (I'm not at my Mac right now) it does nothing.
What am I missing?

I am using MAC OSx 10.5.8 (9L31a) as my operation system.  The TV says "No signal.  Check connected device's power, cable connection and source selection."  Seems to me that that goes in hand with what the Samsung tech said about the Mac needing to be forces to use the external display.  But how do I do that?

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